21515152941 has 6 divisors (see below), whose sum is σ = 31077443150. Its totient is φ = 14343435288.

The previous prime is 21515152937. The next prime is 21515152943. The reversal of 21515152941 is 14925151512.

21515152941 is a `hidden beast` number, since 2 + 1 + 51 + 515 + 2 + 94 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21389062500 + 126090441 = 146250^2 + 11229^2 .

It is not a de Polignac number, because 21515152941 - 2² = 21515152937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21515152896 and 21515152905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515152943) 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, 1195286266 + ... + 1195286283.

Almost surely, 2^21515152941 is an apocalyptic number.

It is an amenable number.

21515152941 is a deficient number, since it is larger than the sum of its proper divisors (9562290209).

21515152941 is a wasteful number, since it uses less digits than its factorization.

21515152941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390572555 (or 2390572552 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The spelling of 21515152941 in words is "twenty-one billion, five hundred fifteen million, one hundred fifty-two thousand, nine hundred forty-one".