21907151273 has 16 divisors (see below), whose sum is σ = 25101861120. Its totient is φ = 18728793600.

The previous prime is 21907151249. The next prime is 21907151309. The reversal of 21907151273 is 37215170912.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21907151273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21907151873) 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, 4986908 + ... + 4991298.

It is an arithmetic number, because the mean of its divisors is an integer number (1568866320).

Almost surely, 2^21907151273 is an apocalyptic number.

It is an amenable number.

21907151273 is a deficient number, since it is larger than the sum of its proper divisors (3194709847).

21907151273 is an equidigital number, since it uses as much as digits as its factorization.

21907151273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088.

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 21907151273 in words is "twenty-one billion, nine hundred seven million, one hundred fifty-one thousand, two hundred seventy-three".