21125240200204 has 48 divisors (see below), whose sum is σ = 42414191479296. Its totient is φ = 9018631699200.

The previous prime is 21125240200153. The next prime is 21125240200243. The reversal of 21125240200204 is 40200204252112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12465844 + ... + 14058724.

It is an arithmetic number, because the mean of its divisors is an integer number (883628989152).

Almost surely, 2^{21125240200204} is an apocalyptic number.

It is an amenable number.

21125240200204 is an abundant number, since it is smaller than the sum of its proper divisors (21288951279092).

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

21125240200204 is a wasteful number, since it uses less digits than its factorization.

21125240200204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594726 (or 1594724 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21125240200204 its reverse (40200204252112), we get a palindrome (61325444452316).

The spelling of 21125240200204 in words is "twenty-one trillion, one hundred twenty-five billion, two hundred forty million, two hundred thousand, two hundred four".