21881275207 has 8 divisors (see below), whose sum is σ = 23879074320. Its totient is φ = 19884908160.

The previous prime is 21881275177. The next prime is 21881275231. The reversal of 21881275207 is 70257218812.

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 21881275207 - 2⁷ = 21881275079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21881275237) 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, 325938 + ... + 387295.

It is an arithmetic number, because the mean of its divisors is an integer number (2984884290).

Almost surely, 2^21881275207 is an apocalyptic number.

21881275207 is a deficient number, since it is larger than the sum of its proper divisors (1997799113).

21881275207 is a wasteful number, since it uses less digits than its factorization.

21881275207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716033.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 21881275207 in words is "twenty-one billion, eight hundred eighty-one million, two hundred seventy-five thousand, two hundred seven".