100401223521 has 4 divisors (see below), whose sum is σ = 133868298032. Its totient is φ = 66934149012.

The previous prime is 100401223519. The next prime is 100401223541. The reversal of 100401223521 is 125322104001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100401223521 - 2¹ = 100401223519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100401223511) 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, 16733537251 + ... + 16733537256.

It is an arithmetic number, because the mean of its divisors is an integer number (33467074508).

Almost surely, 2^100401223521 is an apocalyptic number.

It is an amenable number.

100401223521 is a deficient number, since it is larger than the sum of its proper divisors (33467074511).

100401223521 is an equidigital number, since it uses as much as digits as its factorization.

100401223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33467074510.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 100401223521 its reverse (125322104001), we get a palindrome (225723327522).

The spelling of 100401223521 in words is "one hundred billion, four hundred one million, two hundred twenty-three thousand, five hundred twenty-one".