21361615402 has 8 divisors (see below), whose sum is σ = 32585515200. Its totient is φ = 10499777004.

The previous prime is 21361615397. The next prime is 21361615417. The reversal of 21361615402 is 20451616312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21361615402² (a number of 21 digits) contains 22 as substring.

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, 90515202 + ... + 90515437.

It is an arithmetic number, because the mean of its divisors is an integer number (4073189400).

Almost surely, 2^21361615402 is an apocalyptic number.

21361615402 is a deficient number, since it is larger than the sum of its proper divisors (11223899798).

21361615402 is a wasteful number, since it uses less digits than its factorization.

21361615402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181030700.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21361615402 in words is "twenty-one billion, three hundred sixty-one million, six hundred fifteen thousand, four hundred two".