21470071126520 has 16 divisors (see below), whose sum is σ = 48307660034760. Its totient is φ = 8588028450592.

The previous prime is 21470071126499. The next prime is 21470071126523. The reversal of 21470071126520 is 2562117007412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470071126523) 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, 268375889042 + ... + 268375889121.

Almost surely, 2^{21470071126520} is an apocalyptic number.

21470071126520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21470071126520 is an abundant number, since it is smaller than the sum of its proper divisors (26837588908240).

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

21470071126520 is a wasteful number, since it uses less digits than its factorization.

21470071126520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536751778174 (or 536751778170 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 21470071126520 in words is "twenty-one trillion, four hundred seventy billion, seventy-one million, one hundred twenty-six thousand, five hundred twenty".