21211999970 has 64 divisors (see below), whose sum is σ = 43950816000. Its totient is φ = 7220378880.

The previous prime is 21211999967. The next prime is 21211999979. The reversal of 21211999970 is 7999911212.

It is not an unprimeable number, because it can be changed into a prime (21211999979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10882556 + ... + 10884504.

It is an arithmetic number, because the mean of its divisors is an integer number (686731500).

Almost surely, 2^21211999970 is an apocalyptic number.

21211999970 is an abundant number, since it is smaller than the sum of its proper divisors (22738816030).

21211999970 is a wasteful number, since it uses less digits than its factorization.

21211999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003.

The product of its (nonzero) digits is 183708, while the sum is 50.

The spelling of 21211999970 in words is "twenty-one billion, two hundred eleven million, nine hundred ninety-nine thousand, nine hundred seventy".