72121532142077 has 16 divisors (see below), whose sum is σ = 83312890345152. Its totient is φ = 61703273483520.

The previous prime is 72121532142067. The next prime is 72121532142113. The reversal of 72121532142077 is 77024123512127.

It is not a de Polignac number, because 72121532142077 - 2²⁶ = 72121465033213 is a prime.

It is a super-2 number, since 2×72121532142077² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72121532142067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13271663 + ... + 17899164.

It is an arithmetic number, because the mean of its divisors is an integer number (5207055646572).

Almost surely, 2^{72121532142077} is an apocalyptic number.

It is an amenable number.

72121532142077 is a deficient number, since it is larger than the sum of its proper divisors (11191358203075).

72121532142077 is a wasteful number, since it uses less digits than its factorization.

72121532142077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31183228.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 72121532142077 in words is "seventy-two trillion, one hundred twenty-one billion, five hundred thirty-two million, one hundred forty-two thousand, seventy-seven".