21113015510 has 16 divisors (see below), whose sum is σ = 38352085200. Its totient is φ = 8367726816.

The previous prime is 21113015509. The next prime is 21113015563. The reversal of 21113015510 is 1551031112.

It is a happy number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 9683780 + ... + 9685959.

It is an arithmetic number, because the mean of its divisors is an integer number (2397005325).

Almost surely, 2^21113015510 is an apocalyptic number.

21113015510 is a deficient number, since it is larger than the sum of its proper divisors (17239069690).

21113015510 is a wasteful number, since it uses less digits than its factorization.

21113015510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19369855.

The product of its (nonzero) digits is 150, while the sum is 20.

Adding to 21113015510 its reverse (1551031112), we get a palindrome (22664046622).

The spelling of 21113015510 in words is "twenty-one billion, one hundred thirteen million, fifteen thousand, five hundred ten".