121132020021 has 4 divisors (see below), whose sum is σ = 161509360032. Its totient is φ = 80754680012.

The previous prime is 121132020017. The next prime is 121132020043. The reversal of 121132020021 is 120020231121.

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 121132020021 - 2² = 121132020017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121132020221) 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, 20188670001 + ... + 20188670006.

It is an arithmetic number, because the mean of its divisors is an integer number (40377340008).

Almost surely, 2^121132020021 is an apocalyptic number.

It is an amenable number.

121132020021 is a deficient number, since it is larger than the sum of its proper divisors (40377340011).

121132020021 is an equidigital number, since it uses as much as digits as its factorization.

121132020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40377340010.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121132020021 its reverse (120020231121), we get a palindrome (241152251142).

The spelling of 121132020021 in words is "one hundred twenty-one billion, one hundred thirty-two million, twenty thousand, twenty-one".