21421185876688 has 60 divisors (see below), whose sum is σ = 44948538704640. Its totient is φ = 9885199229568.

The previous prime is 21421185876683. The next prime is 21421185876689. The reversal of 21421185876688 is 88667858112412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421185876683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17299345 + ... + 18496207.

It is an arithmetic number, because the mean of its divisors is an integer number (749142311744).

Almost surely, 2^{21421185876688} is an apocalyptic number.

It is an amenable number.

21421185876688 is an abundant number, since it is smaller than the sum of its proper divisors (23527352827952).

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

21421185876688 is a wasteful number, since it uses less digits than its factorization.

21421185876688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203516 (or 1203497 counting only the distinct ones).

The product of its digits is 82575360, while the sum is 67.

The spelling of 21421185876688 in words is "twenty-one trillion, four hundred twenty-one billion, one hundred eighty-five million, eight hundred seventy-six thousand, six hundred eighty-eight".