21788836410 has 32 divisors (see below), whose sum is σ = 57047136192. Its totient is φ = 5282142080.

The previous prime is 21788836373. The next prime is 21788836417. The reversal of 21788836410 is 1463888712.

It is a self number, because there is not a number n which added to its sum of digits gives 21788836410.

It is not an unprimeable number, because it can be changed into a prime (21788836417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33013059 + ... + 33013718.

It is an arithmetic number, because the mean of its divisors is an integer number (1782723006).

Almost surely, 2^21788836410 is an apocalyptic number.

21788836410 is an abundant number, since it is smaller than the sum of its proper divisors (35258299782).

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

21788836410 is a wasteful number, since it uses less digits than its factorization.

21788836410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66026798.

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 21788836410 in words is "twenty-one billion, seven hundred eighty-eight million, eight hundred thirty-six thousand, four hundred ten".