1201212112021 has 4 divisors (see below), whose sum is σ = 1218130592544. Its totient is φ = 1184293631500.

The previous prime is 1201212111997. The next prime is 1201212112039. The reversal of 1201212112021 is 1202112121021.

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 a cyclic number.

It is not a de Polignac number, because 1201212112021 - 2⁵ = 1201212111989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201212111986 and 1201212112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212112081) 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, 8459240155 + ... + 8459240296.

It is an arithmetic number, because the mean of its divisors is an integer number (304532648136).

Almost surely, 2^{1201212112021} is an apocalyptic number.

It is an amenable number.

1201212112021 is a deficient number, since it is larger than the sum of its proper divisors (16918480523).

1201212112021 is an equidigital number, since it uses as much as digits as its factorization.

1201212112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16918480522.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1201212112021 its reverse (1202112121021), we get a palindrome (2403324233042).

The spelling of 1201212112021 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred twelve thousand, twenty-one".