21203650604025 has 144 divisors (see below), whose sum is σ = 38863182978048. Its totient is φ = 11047958064000.

The previous prime is 21203650604021. The next prime is 21203650604077. The reversal of 21203650604025 is 52040605630212.

21203650604025 is a `hidden beast` number, since 2 + 1 + 20 + 3 + 6 + 5 + 0 + 604 + 0 + 25 = 666.

It is not a de Polignac number, because 21203650604025 - 2² = 21203650604021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203650604021) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5511734652 + ... + 5511738498.

Almost surely, 2^{21203650604025} is an apocalyptic number.

21203650604025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21203650604025 is a deficient number, since it is larger than the sum of its proper divisors (17659532374023).

21203650604025 is a wasteful number, since it uses less digits than its factorization.

21203650604025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852 (or 6844 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21203650604025 in words is "twenty-one trillion, two hundred three billion, six hundred fifty million, six hundred four thousand, twenty-five".