72087023221 has 2 divisors, whose sum is σ = 72087023222. Its totient is φ = 72087023220.

The previous prime is 72087023201. The next prime is 72087023263. The reversal of 72087023221 is 12232078027.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71014788196 + 1072235025 = 266486^2 + 32745^2 .

It is a cyclic number.

It is not a de Polignac number, because 72087023221 - 2²⁹ = 71550152309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72087023201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36043511610 + 36043511611.

It is an arithmetic number, because the mean of its divisors is an integer number (36043511611).

Almost surely, 2^72087023221 is an apocalyptic number.

It is an amenable number.

72087023221 is a deficient number, since it is larger than the sum of its proper divisors (1).

72087023221 is an equidigital number, since it uses as much as digits as its factorization.

72087023221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 72087023221 in words is "seventy-two billion, eighty-seven million, twenty-three thousand, two hundred twenty-one".