101023431021421 has 4 divisors (see below), whose sum is σ = 101023933304700. Its totient is φ = 101022928738144.

The previous prime is 101023431021419. The next prime is 101023431021433. The reversal of 101023431021421 is 124120134320101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10887129189225 + 90136301832196 = 3299565^2 + 9494014^2 .

It is a cyclic number.

It is not a de Polignac number, because 101023431021421 - 2¹ = 101023431021419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101023431025421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250839826 + ... + 251242243.

It is an arithmetic number, because the mean of its divisors is an integer number (25255983326175).

Almost surely, 2^{101023431021421} is an apocalyptic number.

It is an amenable number.

101023431021421 is a deficient number, since it is larger than the sum of its proper divisors (502283279).

101023431021421 is an equidigital number, since it uses as much as digits as its factorization.

101023431021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502283278.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 101023431021421 its reverse (124120134320101), we get a palindrome (225143565341522).

The spelling of 101023431021421 in words is "one hundred one trillion, twenty-three billion, four hundred thirty-one million, twenty-one thousand, four hundred twenty-one".