21895017829204 has 72 divisors (see below), whose sum is σ = 41706934093440. Its totient is φ = 10052770291200.

The previous prime is 21895017829163. The next prime is 21895017829213. The reversal of 21895017829204 is 40292871059812.

It is a super-2 number, since 2×21895017829204² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120635484 + ... + 120816844.

It is an arithmetic number, because the mean of its divisors is an integer number (579262973520).

Almost surely, 2^{21895017829204} is an apocalyptic number.

It is an amenable number.

21895017829204 is a deficient number, since it is larger than the sum of its proper divisors (19811916264236).

21895017829204 is a wasteful number, since it uses less digits than its factorization.

21895017829204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182321 (or 182306 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 21895017829204 in words is "twenty-one trillion, eight hundred ninety-five billion, seventeen million, eight hundred twenty-nine thousand, two hundred four".