21151224355215 has 32 divisors (see below), whose sum is σ = 35624278241280. Its totient is φ = 10686585350016.

The previous prime is 21151224355213. The next prime is 21151224355231. The reversal of 21151224355215 is 51255342215112.

It is not a de Polignac number, because 21151224355215 - 2¹ = 21151224355213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151224355213) 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, 7642194 + ... + 10035216.

It is an arithmetic number, because the mean of its divisors is an integer number (1113258695040).

Almost surely, 2^{21151224355215} is an apocalyptic number.

21151224355215 is a deficient number, since it is larger than the sum of its proper divisors (14473053886065).

21151224355215 is a wasteful number, since it uses less digits than its factorization.

21151224355215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424063.

The product of its digits is 120000, while the sum is 39.

The spelling of 21151224355215 in words is "twenty-one trillion, one hundred fifty-one billion, two hundred twenty-four million, three hundred fifty-five thousand, two hundred fifteen".