121012220021 has 16 divisors (see below), whose sum is σ = 150893342208. Its totient is φ = 94282134000.

The previous prime is 121012219997. The next prime is 121012220051. The reversal of 121012220021 is 120022210121.

It is a cyclic number.

It is not a de Polignac number, because 121012220021 - 2⁶ = 121012219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121012219978 and 121012220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012220051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 468266 + ... + 679188.

It is an arithmetic number, because the mean of its divisors is an integer number (9430833888).

Almost surely, 2^121012220021 is an apocalyptic number.

121012220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121012220021 is a deficient number, since it is larger than the sum of its proper divisors (29881122187).

121012220021 is a wasteful number, since it uses less digits than its factorization.

121012220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218392.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121012220021 its reverse (120022210121), we get a palindrome (241034430142).

The spelling of 121012220021 in words is "one hundred twenty-one billion, twelve million, two hundred twenty thousand, twenty-one".