21231202510 has 32 divisors (see below), whose sum is σ = 44415889920. Its totient is φ = 7155890592.

The previous prime is 21231202481. The next prime is 21231202529. The reversal of 21231202510 is 1520213212.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2566234 + ... + 2574493.

It is an arithmetic number, because the mean of its divisors is an integer number (1387996560).

Almost surely, 2^21231202510 is an apocalyptic number.

21231202510 is an abundant number, since it is smaller than the sum of its proper divisors (23184687410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231202510 is a wasteful number, since it uses less digits than its factorization.

21231202510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140800.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21231202510 its reverse (1520213212), we get a palindrome (22751415722).

The spelling of 21231202510 in words is "twenty-one billion, two hundred thirty-one million, two hundred two thousand, five hundred ten".