21110013312 has 64 divisors (see below), whose sum is σ = 56992773360. Its totient is φ = 6921308160.

The previous prime is 21110013307. The next prime is 21110013317. The reversal of 21110013312 is 21331001112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21110013307) and next prime (21110013317).

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21110013291 and 21110013300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110013317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427183 + ... + 474030.

Almost surely, 2^21110013312 is an apocalyptic number.

It is an amenable number.

21110013312 is an abundant number, since it is smaller than the sum of its proper divisors (35882760048).

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

21110013312 is an equidigital number, since it uses as much as digits as its factorization.

21110013312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901291 (or 901279 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21110013312 its reverse (21331001112), we get a palindrome (42441014424).

The spelling of 21110013312 in words is "twenty-one billion, one hundred ten million, thirteen thousand, three hundred twelve".