113121213021 has 6 divisors (see below), whose sum is σ = 163397307710. Its totient is φ = 75414142008.

The previous prime is 113121213001. The next prime is 113121213041. The reversal of 113121213021 is 120312121311.

It is an interprime number because it is at equal distance from previous prime (113121213001) and next prime (113121213041).

It can be written as a sum of positive squares in only one way, i.e., 108375932025 + 4745280996 = 329205^2 + 68886^2 .

It is not a de Polignac number, because 113121213021 - 2⁵ = 113121212989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113121212985 and 113121213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113121213001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6284511826 + ... + 6284511843.

Almost surely, 2^113121213021 is an apocalyptic number.

It is an amenable number.

113121213021 is a deficient number, since it is larger than the sum of its proper divisors (50276094689).

113121213021 is a wasteful number, since it uses less digits than its factorization.

113121213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12569023675 (or 12569023672 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 113121213021 its reverse (120312121311), we get a palindrome (233433334332).

The spelling of 113121213021 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred thirteen thousand, twenty-one".