21515050000331 has 4 divisors (see below), whose sum is σ = 22647421053000. Its totient is φ = 20382678947664.

The previous prime is 21515050000319. The next prime is 21515050000373. The reversal of 21515050000331 is 13300005051512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21515050000331 - 2¹⁰ = 21515049999307 is a prime.

It is a super-2 number, since 2×21515050000331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21515050000331.

It is not an unprimeable number, because it can be changed into a prime (21515050000391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566185526306 + ... + 566185526343.

It is an arithmetic number, because the mean of its divisors is an integer number (5661855263250).

Almost surely, 2^{21515050000331} is an apocalyptic number.

21515050000331 is a deficient number, since it is larger than the sum of its proper divisors (1132371052669).

21515050000331 is a wasteful number, since it uses less digits than its factorization.

21515050000331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132371052668.

The product of its (nonzero) digits is 2250, while the sum is 26.

Adding to 21515050000331 its reverse (13300005051512), we get a palindrome (34815055051843).

The spelling of 21515050000331 in words is "twenty-one trillion, five hundred fifteen billion, fifty million, three hundred thirty-one", and thus it is an aban number.