21436051056 has 40 divisors (see below), whose sum is σ = 63287389824. Its totient is φ = 6124585920.

The previous prime is 21436051051. The next prime is 21436051057. The reversal of 21436051056 is 65015063412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436051051) 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, 31898550 + ... + 31899221.

Almost surely, 2^21436051056 is an apocalyptic number.

It is an amenable number.

21436051056 is an abundant number, since it is smaller than the sum of its proper divisors (41851338768).

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

21436051056 is a wasteful number, since it uses less digits than its factorization.

21436051056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63797789 (or 63797783 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 21436051056 in words is "twenty-one billion, four hundred thirty-six million, fifty-one thousand, fifty-six".