21270922904 has 128 divisors (see below), whose sum is σ = 51144307200. Its totient is φ = 8053693440.

The previous prime is 21270922901. The next prime is 21270922913. The reversal of 21270922904 is 40922907212.

It is a super-2 number, since 2×21270922904² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270922901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3490292 + ... + 3496380.

It is an arithmetic number, because the mean of its divisors is an integer number (399564900).

Almost surely, 2^21270922904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21270922904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25572153600).

21270922904 is an abundant number, since it is smaller than the sum of its proper divisors (29873384296).

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

21270922904 is a wasteful number, since it uses less digits than its factorization.

21270922904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273 (or 6269 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 21270922904 in words is "twenty-one billion, two hundred seventy million, nine hundred twenty-two thousand, nine hundred four".