23051021 has 6 divisors (see below), whose sum is σ = 26814510. Its totient is φ = 19757976.

The previous prime is 23051003. The next prime is 23051023. The reversal of 23051021 is 12015032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 592900 = 4739^2 + 770^2 .

It is not a de Polignac number, because 23051021 - 2¹⁰ = 23049997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23050987 and 23051005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23051023) 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, 235166 + ... + 235263.

It is an arithmetic number, because the mean of its divisors is an integer number (4469085).

Almost surely, 2^23051021 is an apocalyptic number.

It is an amenable number.

23051021 is a deficient number, since it is larger than the sum of its proper divisors (3763489).

23051021 is an equidigital number, since it uses as much as digits as its factorization.

23051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470443 (or 470436 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 23051021 is about 4801.1478835795. The cubic root of 23051021 is about 284.5968281004.

Adding to 23051021 its reverse (12015032), we get a palindrome (35066053).

The spelling of 23051021 in words is "twenty-three million, fifty-one thousand, twenty-one".