72021057229 has 12 divisors (see below), whose sum is σ = 79224850012. Its totient is φ = 65423064960.

The previous prime is 72021057211. The next prime is 72021057301. The reversal of 72021057229 is 92275012027.

It can be written as a sum of positive squares in 2 ways, for example, as 44861358025 + 27159699204 = 211805^2 + 164802^2 .

It is not a de Polignac number, because 72021057229 - 2¹⁵ = 72021024461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72021057629) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 72522 + ... + 386395.

Almost surely, 2^72021057229 is an apocalyptic number.

It is an amenable number.

72021057229 is a deficient number, since it is larger than the sum of its proper divisors (7203792783).

72021057229 is a wasteful number, since it uses less digits than its factorization.

72021057229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460236 (or 460225 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 72021057229 in words is "seventy-two billion, twenty-one million, fifty-seven thousand, two hundred twenty-nine".