121221100120021 has 16 divisors (see below), whose sum is σ = 133801860144960. Its totient is φ = 108903806369280.

The previous prime is 121221100119971. The next prime is 121221100120031. The reversal of 121221100120021 is 120021001122121.

It is a cyclic number.

It is not a de Polignac number, because 121221100120021 - 2¹¹ = 121221100117973 is a prime.

It is a super-2 number, since 2×121221100120021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221100119977 and 121221100120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221100120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83184051 + ... + 84628768.

It is an arithmetic number, because the mean of its divisors is an integer number (8362616259060).

Almost surely, 2^{121221100120021} is an apocalyptic number.

121221100120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221100120021 is a deficient number, since it is larger than the sum of its proper divisors (12580760024939).

121221100120021 is a wasteful number, since it uses less digits than its factorization.

121221100120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167813604.

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

Adding to 121221100120021 its reverse (120021001122121), we get a palindrome (241242101242142).

The spelling of 121221100120021 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, twenty-one".