21121702907 has 8 divisors (see below), whose sum is σ = 22800039840. Its totient is φ = 19506699520.

The previous prime is 21121702897. The next prime is 21121702909. The reversal of 21121702907 is 70920712112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121702907 - 2²⁴ = 21104925691 is a prime.

It is a super-2 number, since 2×21121702907² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121702909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15832694 + ... + 15834027.

It is an arithmetic number, because the mean of its divisors is an integer number (2850004980).

Almost surely, 2^21121702907 is an apocalyptic number.

21121702907 is a deficient number, since it is larger than the sum of its proper divisors (1678336933).

21121702907 is a wasteful number, since it uses less digits than its factorization.

21121702907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31666773.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 21121702907 in words is "twenty-one billion, one hundred twenty-one million, seven hundred two thousand, nine hundred seven".