21153051215 has 8 divisors (see below), whose sum is σ = 26719643760. Its totient is φ = 16031786112.

The previous prime is 21153051197. The next prime is 21153051223. The reversal of 21153051215 is 51215035112.

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 21153051215 - 2¹² = 21153047119 is a prime.

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, 111331754 + ... + 111331943.

It is an arithmetic number, because the mean of its divisors is an integer number (3339955470).

Almost surely, 2^21153051215 is an apocalyptic number.

21153051215 is a deficient number, since it is larger than the sum of its proper divisors (5566592545).

21153051215 is a wasteful number, since it uses less digits than its factorization.

21153051215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222663721.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 21153051215 its reverse (51215035112), we get a palindrome (72368086327).

The spelling of 21153051215 in words is "twenty-one billion, one hundred fifty-three million, fifty-one thousand, two hundred fifteen".