7221500872858 has 4 divisors (see below), whose sum is σ = 10832251309290. Its totient is φ = 3610750436428.

The previous prime is 7221500872849. The next prime is 7221500872897. The reversal of 7221500872858 is 8582780051227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6083637049009 + 1137863823849 = 2466503^2 + 1066707^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7221500872799 and 7221500872808.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805375218213 + ... + 1805375218216.

Almost surely, 2^{7221500872858} is an apocalyptic number.

7221500872858 is a deficient number, since it is larger than the sum of its proper divisors (3610750436432).

7221500872858 is a wasteful number, since it uses less digits than its factorization.

7221500872858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610750436431.

The product of its (nonzero) digits is 5017600, while the sum is 55.

The spelling of 7221500872858 in words is "seven trillion, two hundred twenty-one billion, five hundred million, eight hundred seventy-two thousand, eight hundred fifty-eight".