21211022408 has 32 divisors (see below), whose sum is σ = 40540756800. Its totient is φ = 10401538752.

The previous prime is 21211022407. The next prime is 21211022431. The reversal of 21211022408 is 80422011212.

It is not an unprimeable number, because it can be changed into a prime (21211022407) 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, 36341 + ... + 209147.

It is an arithmetic number, because the mean of its divisors is an integer number (1266898650).

Almost surely, 2^21211022408 is an apocalyptic number.

It is an amenable number.

21211022408 is a deficient number, since it is larger than the sum of its proper divisors (19329734392).

21211022408 is a wasteful number, since it uses less digits than its factorization.

21211022408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173109 (or 173105 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 21211022408 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, four hundred eight".