121001222100021 has 4 divisors (see below), whose sum is σ = 161334962800032. Its totient is φ = 80667481400012.

The previous prime is 121001222100001. The next prime is 121001222100041. The reversal of 121001222100021 is 120001222100121.

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 an interprime number because it is at equal distance from previous prime (121001222100001) and next prime (121001222100041).

It is a cyclic number.

It is not a de Polignac number, because 121001222100021 - 2¹⁸ = 121001221837877 is a prime.

It is a super-2 number, since 2×121001222100021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001222100001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20166870350001 + ... + 20166870350006.

It is an arithmetic number, because the mean of its divisors is an integer number (40333740700008).

Almost surely, 2^{121001222100021} is an apocalyptic number.

It is an amenable number.

121001222100021 is a deficient number, since it is larger than the sum of its proper divisors (40333740700011).

121001222100021 is an equidigital number, since it uses as much as digits as its factorization.

121001222100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40333740700010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121001222100021 its reverse (120001222100121), we get a palindrome (241002444200142).

The spelling of 121001222100021 in words is "one hundred twenty-one trillion, one billion, two hundred twenty-two million, one hundred thousand, twenty-one".