73221015 has 32 divisors (see below), whose sum is σ = 134217216. Its totient is φ = 33390720.

The previous prime is 73220999. The next prime is 73221047. The reversal of 73221015 is 51012237.

It is not a de Polignac number, because 73221015 - 2⁴ = 73220999 is a prime.

It is a super-2 number, since 2×73221015² = 10722634075260450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 73220982 and 73221000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71205 + ... + 72225.

It is an arithmetic number, because the mean of its divisors is an integer number (4194288).

Almost surely, 2^73221015 is an apocalyptic number.

73221015 is a deficient number, since it is larger than the sum of its proper divisors (60996201).

73221015 is a wasteful number, since it uses less digits than its factorization.

73221015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 73221015 is about 8556.9278949866. The cubic root of 73221015 is about 418.3552739860.

The spelling of 73221015 in words is "seventy-three million, two hundred twenty-one thousand, fifteen".