21224541015 has 48 divisors (see below), whose sum is σ = 37334668800. Its totient is φ = 11153039040.

The previous prime is 21224540999. The next prime is 21224541017. The reversal of 21224541015 is 51014542212.

It is a happy number.

21224541015 is a `hidden beast` number, since 2 + 1 + 2 + 245 + 410 + 1 + 5 = 666.

It is not a de Polignac number, because 21224541015 - 2⁴ = 21224540999 is a prime.

It is a super-2 number, since 2×21224541015² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21224541015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224541017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 910860 + ... + 933870.

It is an arithmetic number, because the mean of its divisors is an integer number (777805600).

Almost surely, 2^21224541015 is an apocalyptic number.

21224541015 is a deficient number, since it is larger than the sum of its proper divisors (16110127785).

21224541015 is a wasteful number, since it uses less digits than its factorization.

21224541015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23324 (or 23321 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The spelling of 21224541015 in words is "twenty-one billion, two hundred twenty-four million, five hundred forty-one thousand, fifteen".