21890967270 has 32 divisors (see below), whose sum is σ = 52564695552. Its totient is φ = 5834660832.

The previous prime is 21890967257. The next prime is 21890967299. The reversal of 21890967270 is 7276909812.

It is a super-2 number, since 2×21890967270² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122062 + ... + 242241.

It is an arithmetic number, because the mean of its divisors is an integer number (1642646736).

Almost surely, 2^21890967270 is an apocalyptic number.

21890967270 is an abundant number, since it is smaller than the sum of its proper divisors (30673728282).

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

21890967270 is a wasteful number, since it uses less digits than its factorization.

21890967270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366316.

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 21890967270 in words is "twenty-one billion, eight hundred ninety million, nine hundred sixty-seven thousand, two hundred seventy".