121011221220021 has 512 divisors, whose sum is σ = 220055076864000. Its totient is φ = 64901407334400.

The previous prime is 121011221220007. The next prime is 121011221220031. The reversal of 121011221220021 is 120022122110121.

121011221220021 is a `hidden beast` number, since 1 + 210 + 11 + 221 + 2 + 200 + 21 = 666.

It is not a de Polignac number, because 121011221220021 - 2⁵ = 121011221219989 is a prime.

It is a super-2 number, since 2×121011221220021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121011221219976 and 121011221220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011221220031) by changing a digit.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 214940001886 + ... + 214940002448.

It is an arithmetic number, because the mean of its divisors is an integer number (429795072000).

Almost surely, 2^{121011221220021} is an apocalyptic number.

121011221220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121011221220021 is a deficient number, since it is larger than the sum of its proper divisors (99043855643979).

121011221220021 is a wasteful number, since it uses less digits than its factorization.

121011221220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121011221220021 its reverse (120022122110121), we get a palindrome (241033343330142).

The spelling of 121011221220021 in words is "one hundred twenty-one trillion, eleven billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".