21900000970 has 32 divisors (see below), whose sum is σ = 41514367680. Its totient is φ = 8295022080.

The previous prime is 21900000961. The next prime is 21900000977. The reversal of 21900000970 is 7900000912.

21900000970 is a nontrivial binomial coefficient, being equal to C(209285, 2).

It is a super-2 number, since 2×21900000970² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21900000977) 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, 392410 + ... + 444730.

It is an arithmetic number, because the mean of its divisors is an integer number (1297323990).

Almost surely, 2^21900000970 is an apocalyptic number.

21900000970 is the 209284-th triangular number.

21900000970 is the 69762-nd centered nonagonal number.

21900000970 is a deficient number, since it is larger than the sum of its proper divisors (19614366710).

21900000970 is a wasteful number, since it uses less digits than its factorization.

21900000970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54550.

The product of its (nonzero) digits is 1134, while the sum is 28.

The spelling of 21900000970 in words is "twenty-one billion, nine hundred million, nine hundred seventy", and thus it is an aban number.