21474653215 has 8 divisors (see below), whose sum is σ = 27285441840. Its totient is φ = 16169150592.

The previous prime is 21474653209. The next prime is 21474653231. The reversal of 21474653215 is 51235647412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21474653215 is a prime.

It is a super-2 number, since 2×21474653215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126321405 + ... + 126321574.

It is an arithmetic number, because the mean of its divisors is an integer number (3410680230).

Almost surely, 2^21474653215 is an apocalyptic number.

21474653215 is a deficient number, since it is larger than the sum of its proper divisors (5810788625).

21474653215 is a wasteful number, since it uses less digits than its factorization.

21474653215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252643001.

The product of its digits is 201600, while the sum is 40.

The spelling of 21474653215 in words is "twenty-one billion, four hundred seventy-four million, six hundred fifty-three thousand, two hundred fifteen".