23001021 has 6 divisors (see below), whose sum is σ = 33223710. Its totient is φ = 15334008.

The previous prime is 23001019. The next prime is 23001049. The reversal of 23001021 is 12010032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 7080921 = 3990^2 + 2661^2 .

It is not a de Polignac number, because 23001021 - 2¹ = 23001019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2555669 = 23001021 / (2 + 3 + 0 + 0 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 23000994 and 23001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23003021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1277826 + ... + 1277843.

It is an arithmetic number, because the mean of its divisors is an integer number (5537285).

Almost surely, 2^23001021 is an apocalyptic number.

It is an amenable number.

23001021 is a deficient number, since it is larger than the sum of its proper divisors (10222689).

23001021 is a wasteful number, since it uses less digits than its factorization.

23001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555675 (or 2555672 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 23001021 is about 4795.9379687398. The cubic root of 23001021 is about 284.3909060217.

Adding to 23001021 its reverse (12010032), we get a palindrome (35011053).

It can be divided in two parts, 2300 and 1021, that added together give a triangular number (3321 = T₈₁).

The spelling of 23001021 in words is "twenty-three million, one thousand, twenty-one".