121000100220021 has 32 divisors (see below), whose sum is σ = 177616777789440. Its totient is φ = 72659812190400.

The previous prime is 121000100220019. The next prime is 121000100220029. The reversal of 121000100220021 is 120022001000121.

It is not a de Polignac number, because 121000100220021 - 2¹ = 121000100220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121000100219979 and 121000100220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000100220029) 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, 582549016 + ... + 582756686.

It is an arithmetic number, because the mean of its divisors is an integer number (5550524305920).

Almost surely, 2^{121000100220021} is an apocalyptic number.

121000100220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121000100220021 is a deficient number, since it is larger than the sum of its proper divisors (56616677569419).

121000100220021 is a wasteful number, since it uses less digits than its factorization.

121000100220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369777.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121000100220021 its reverse (120022001000121), we get a palindrome (241022101220142).

The spelling of 121000100220021 in words is "one hundred twenty-one trillion, one hundred million, two hundred twenty thousand, twenty-one".