21453152215 has 32 divisors (see below), whose sum is σ = 28914278400. Its totient is φ = 15144940800.

The previous prime is 21453152213. The next prime is 21453152249. The reversal of 21453152215 is 51225135412.

It is not a de Polignac number, because 21453152215 - 2¹ = 21453152213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453152213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 424842 + ... + 472648.

It is an arithmetic number, because the mean of its divisors is an integer number (903571200).

Almost surely, 2^21453152215 is an apocalyptic number.

21453152215 is a deficient number, since it is larger than the sum of its proper divisors (7461126185).

21453152215 is a wasteful number, since it uses less digits than its factorization.

21453152215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48063.

The product of its digits is 12000, while the sum is 31.

Adding to 21453152215 its reverse (51225135412), we get a palindrome (72678287627).

The spelling of 21453152215 in words is "twenty-one billion, four hundred fifty-three million, one hundred fifty-two thousand, two hundred fifteen".