121200022220021 has 4 divisors (see below), whose sum is σ = 121200257014092. Its totient is φ = 121199787425952.

The previous prime is 121200022219949. The next prime is 121200022220023. The reversal of 121200022220021 is 120022220002121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16245857278225 + 104954164941796 = 4030615^2 + 10244714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121200022220021 is a prime.

It is a super-2 number, since 2×121200022220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200022220023) 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, 116621030 + ... + 117655703.

It is an arithmetic number, because the mean of its divisors is an integer number (30300064253523).

Almost surely, 2^{121200022220021} is an apocalyptic number.

It is an amenable number.

121200022220021 is a deficient number, since it is larger than the sum of its proper divisors (234794071).

121200022220021 is an equidigital number, since it uses as much as digits as its factorization.

121200022220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234794070.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121200022220021 its reverse (120022220002121), we get a palindrome (241222242222142).

The spelling of 121200022220021 in words is "one hundred twenty-one trillion, two hundred billion, twenty-two million, two hundred twenty thousand, twenty-one".