23021001 has 6 divisors (see below), whose sum is σ = 33252570. Its totient is φ = 15347328.

The previous prime is 23020997. The next prime is 23021029. The reversal of 23021001 is 10012032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22099401 + 921600 = 4701^2 + 960^2 .

It is not a de Polignac number, because 23021001 - 2² = 23020997 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: 2557889 = 23021001 / (2 + 3 + 0 + 2 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (23021101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1278936 + ... + 1278953.

It is an arithmetic number, because the mean of its divisors is an integer number (5542095).

Almost surely, 2^23021001 is an apocalyptic number.

It is an amenable number.

23021001 is a deficient number, since it is larger than the sum of its proper divisors (10231569).

23021001 is a wasteful number, since it uses less digits than its factorization.

23021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557895 (or 2557892 counting only the distinct ones).

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

The square root of 23021001 is about 4798.0205293433. The cubic root of 23021001 is about 284.4732282488.

Adding to 23021001 its reverse (10012032), we get a palindrome (33033033).

The spelling of 23021001 in words is "twenty-three million, twenty-one thousand, one".