121020022021 has 4 divisors (see below), whose sum is σ = 122267651212. Its totient is φ = 119772392832.

The previous prime is 121020022009. The next prime is 121020022043. The reversal of 121020022021 is 120220020121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120220020121 = 37 ⋅3249189733.

It can be written as a sum of positive squares in 2 ways, for example, as 17033121121 + 103986900900 = 130511^2 + 322470^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020022021 - 2⁵ = 121020021989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020021992 and 121020022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020022091) 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, 623814450 + ... + 623814643.

It is an arithmetic number, because the mean of its divisors is an integer number (30566912803).

Almost surely, 2^121020022021 is an apocalyptic number.

It is an amenable number.

121020022021 is a deficient number, since it is larger than the sum of its proper divisors (1247629191).

121020022021 is an equidigital number, since it uses as much as digits as its factorization.

121020022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247629190.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121020022021 its reverse (120220020121), we get a palindrome (241240042142).

The spelling of 121020022021 in words is "one hundred twenty-one billion, twenty million, twenty-two thousand, twenty-one".