21513002267 has 8 divisors (see below), whose sum is σ = 21650154960. Its totient is φ = 21375912960.

The previous prime is 21513002213. The next prime is 21513002311. The reversal of 21513002267 is 76220031512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21513002267 - 2²² = 21508807963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21513007267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796667 + ... + 823227.

It is an arithmetic number, because the mean of its divisors is an integer number (2706269370).

Almost surely, 2^21513002267 is an apocalyptic number.

21513002267 is a deficient number, since it is larger than the sum of its proper divisors (137152693).

21513002267 is a wasteful number, since it uses less digits than its factorization.

21513002267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31693.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 21513002267 its reverse (76220031512), we get a palindrome (97733033779).

The spelling of 21513002267 in words is "twenty-one billion, five hundred thirteen million, two thousand, two hundred sixty-seven".