21502928241 has 6 divisors (see below), whose sum is σ = 31059785250. Its totient is φ = 14335285488.

The previous prime is 21502928233. The next prime is 21502928243. The reversal of 21502928241 is 14282920512.

21502928241 is a `hidden beast` number, since 21 + 502 + 92 + 8 + 2 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11474908641 + 10028019600 = 107121^2 + 100140^2 .

It is not a de Polignac number, because 21502928241 - 2³ = 21502928233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21502928196 and 21502928205.

It is not an unprimeable number, because it can be changed into a prime (21502928243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1194607116 + ... + 1194607133.

It is an arithmetic number, because the mean of its divisors is an integer number (5176630875).

Almost surely, 2^21502928241 is an apocalyptic number.

It is an amenable number.

21502928241 is a deficient number, since it is larger than the sum of its proper divisors (9556857009).

21502928241 is a wasteful number, since it uses less digits than its factorization.

21502928241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389214255 (or 2389214252 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 21502928241 in words is "twenty-one billion, five hundred two million, nine hundred twenty-eight thousand, two hundred forty-one".