10252021521 has 24 divisors (see below), whose sum is σ = 15911829984. Its totient is φ = 5854343040.

The previous prime is 10252021511. The next prime is 10252021529. The reversal of 10252021521 is 12512025201.

It is not a de Polignac number, because 10252021521 - 2²¹ = 10249924369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (10252021529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202281 + ... + 247833.

It is an arithmetic number, because the mean of its divisors is an integer number (662992916).

Almost surely, 2^10252021521 is an apocalyptic number.

It is an amenable number.

10252021521 is a deficient number, since it is larger than the sum of its proper divisors (5659808463).

10252021521 is a wasteful number, since it uses less digits than its factorization.

10252021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47101 (or 47094 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 10252021521 its reverse (12512025201), we get a palindrome (22764046722).

The spelling of 10252021521 in words is "ten billion, two hundred fifty-two million, twenty-one thousand, five hundred twenty-one".