121021121110021 has 32 divisors (see below), whose sum is σ = 133619818752000. Its totient is φ = 108696577728000.

The previous prime is 121021121109991. The next prime is 121021121110031. The reversal of 121021121110021 is 120011121120121.

It is a cyclic number.

It is not a de Polignac number, because 121021121110021 - 2⁴³ = 112225028087813 is a prime.

It is a super-2 number, since 2×121021121110021² (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 = 121021121109977 and 121021121110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021121110031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4009829551 + ... + 4009859731.

It is an arithmetic number, because the mean of its divisors is an integer number (4175619336000).

Almost surely, 2^{121021121110021} is an apocalyptic number.

121021121110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121021121110021 is a deficient number, since it is larger than the sum of its proper divisors (12598697641979).

121021121110021 is a wasteful number, since it uses less digits than its factorization.

121021121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43341.

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

Adding to 121021121110021 its reverse (120011121120121), we get a palindrome (241032242230142).

The spelling of 121021121110021 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".