99421521526731 has 16 divisors (see below), whose sum is σ = 136839055730688. Its totient is φ = 64142526854400.

The previous prime is 99421521526637. The next prime is 99421521526759. The reversal of 99421521526731 is 13762512512499.

It is not a de Polignac number, because 99421521526731 - 2⁹ = 99421521526219 is a prime.

It is a super-2 number, since 2×99421521526731² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99421521526231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12524746 + ... + 18860336.

It is an arithmetic number, because the mean of its divisors is an integer number (8552440983168).

Almost surely, 2^{99421521526731} is an apocalyptic number.

99421521526731 is a deficient number, since it is larger than the sum of its proper divisors (37417534203957).

99421521526731 is a wasteful number, since it uses less digits than its factorization.

99421521526731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504362.

The product of its digits is 8164800, while the sum is 57.

The spelling of 99421521526731 in words is "ninety-nine trillion, four hundred twenty-one billion, five hundred twenty-one million, five hundred twenty-six thousand, seven hundred thirty-one".