21224641615 has 16 divisors (see below), whose sum is σ = 26779838976. Its totient is φ = 16117472800.

The previous prime is 21224641583. The next prime is 21224641621. The reversal of 21224641615 is 51614642212.

It is not a de Polignac number, because 21224641615 - 2⁵ = 21224641583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689371 + ... + 719500.

It is an arithmetic number, because the mean of its divisors is an integer number (1673739936).

Almost surely, 2^21224641615 is an apocalyptic number.

21224641615 is a deficient number, since it is larger than the sum of its proper divisors (5555197361).

21224641615 is a wasteful number, since it uses less digits than its factorization.

21224641615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409030.

The product of its digits is 23040, while the sum is 34.

The spelling of 21224641615 in words is "twenty-one billion, two hundred twenty-four million, six hundred forty-one thousand, six hundred fifteen".