21025072036 has 24 divisors (see below), whose sum is σ = 38296177920. Its totient is φ = 10087755552.

The previous prime is 21025071983. The next prime is 21025072049. The reversal of 21025072036 is 63027052012.

It is a junction number, because it is equal to n+sod(n) for n = 21025071995 and 21025072013.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537076 + ... + 574891.

It is an arithmetic number, because the mean of its divisors is an integer number (1595674080).

Almost surely, 2^21025072036 is an apocalyptic number.

It is an amenable number.

21025072036 is a deficient number, since it is larger than the sum of its proper divisors (17271105884).

21025072036 is a wasteful number, since it uses less digits than its factorization.

21025072036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112163 (or 1112161 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The spelling of 21025072036 in words is "twenty-one billion, twenty-five million, seventy-two thousand, thirty-six".