21110520412 has 12 divisors (see below), whose sum is σ = 36947692656. Its totient is φ = 10554036800.

The previous prime is 21110520401. The next prime is 21110520419. The reversal of 21110520412 is 21402501112.

It is a self number, because there is not a number n which added to its sum of digits gives 21110520412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110520419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266464 + ... + 336487.

It is an arithmetic number, because the mean of its divisors is an integer number (3078974388).

Almost surely, 2^21110520412 is an apocalyptic number.

It is an amenable number.

21110520412 is a deficient number, since it is larger than the sum of its proper divisors (15837172244).

21110520412 is a wasteful number, since it uses less digits than its factorization.

21110520412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611708 (or 611706 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The spelling of 21110520412 in words is "twenty-one billion, one hundred ten million, five hundred twenty thousand, four hundred twelve".