21255100510 has 64 divisors (see below), whose sum is σ = 46335784320. Its totient is φ = 6853017600.

The previous prime is 21255100499. The next prime is 21255100547. The reversal of 21255100510 is 1500155212.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 1541326 + ... + 1555054.

It is an arithmetic number, because the mean of its divisors is an integer number (723996630).

Almost surely, 2^21255100510 is an apocalyptic number.

21255100510 is an abundant number, since it is smaller than the sum of its proper divisors (25080683810).

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

21255100510 is a wasteful number, since it uses less digits than its factorization.

21255100510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15061.

The product of its (nonzero) digits is 500, while the sum is 22.

Adding to 21255100510 its reverse (1500155212), we get a palindrome (22755255722).

The spelling of 21255100510 in words is "twenty-one billion, two hundred fifty-five million, one hundred thousand, five hundred ten".