21431173078848 has 112 divisors (see below), whose sum is σ = 61071873954560. Its totient is φ = 6593476184064.

The previous prime is 21431173078841. The next prime is 21431173078853. The reversal of 21431173078848 is 84887037113412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431173078841) 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, 22264761 + ... + 23207367.

It is an arithmetic number, because the mean of its divisors is an integer number (545284588880).

Almost surely, 2^{21431173078848} is an apocalyptic number.

It is an amenable number.

21431173078848 is an abundant number, since it is smaller than the sum of its proper divisors (39640700875712).

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

21431173078848 is a wasteful number, since it uses less digits than its factorization.

21431173078848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951744 (or 951734 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 57.

The spelling of 21431173078848 in words is "twenty-one trillion, four hundred thirty-one billion, one hundred seventy-three million, seventy-eight thousand, eight hundred forty-eight".