21502550304104 has 16 divisors (see below), whose sum is σ = 40325679576420. Its totient is φ = 10749035750400.

The previous prime is 21502550304091. The next prime is 21502550304113. The reversal of 21502550304104 is 40140305520512.

It can be written as a sum of positive squares in 2 ways, for example, as 19296428272900 + 2206122031204 = 4392770^2 + 1485302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279884399 + ... + 279961214.

Almost surely, 2^{21502550304104} is an apocalyptic number.

It is an amenable number.

21502550304104 is a deficient number, since it is larger than the sum of its proper divisors (18823129272316).

21502550304104 is a wasteful number, since it uses less digits than its factorization.

21502550304104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559850420 (or 559850416 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21502550304104 its reverse (40140305520512), we get a palindrome (61642855824616).

The spelling of 21502550304104 in words is "twenty-one trillion, five hundred two billion, five hundred fifty million, three hundred four thousand, one hundred four".