21016155307 has 4 divisors (see below), whose sum is σ = 24018463216. Its totient is φ = 18013847400.

The previous prime is 21016155269. The next prime is 21016155313. The reversal of 21016155307 is 70355161012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21016155307 - 2²³ = 21007766699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21016155317) 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, 1501153944 + ... + 1501153957.

It is an arithmetic number, because the mean of its divisors is an integer number (6004615804).

Almost surely, 2^21016155307 is an apocalyptic number.

21016155307 is a deficient number, since it is larger than the sum of its proper divisors (3002307909).

21016155307 is an equidigital number, since it uses as much as digits as its factorization.

21016155307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002307908.

The product of its (nonzero) digits is 6300, while the sum is 31.

The spelling of 21016155307 in words is "twenty-one billion, sixteen million, one hundred fifty-five thousand, three hundred seven".