121012212020 has 72 divisors (see below), whose sum is σ = 298327879080. Its totient is φ = 41109223680.

The previous prime is 121012212007. The next prime is 121012212023. The reversal of 121012212020 is 20212210121.

It can be written as a sum of positive squares in 4 ways, for example, as 5257120036 + 115755091984 = 72506^2 + 340228^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121012211986 and 121012212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012212023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 459611 + ... + 673250.

It is an arithmetic number, because the mean of its divisors is an integer number (4143442765).

Almost surely, 2^121012212020 is an apocalyptic number.

121012212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121012212020 is an abundant number, since it is smaller than the sum of its proper divisors (177315667060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121012212020 is a wasteful number, since it uses less digits than its factorization.

121012212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132993 (or 1132984 counting only the distinct ones).

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

Adding to 121012212020 its reverse (20212210121), we get a palindrome (141224422141).

The spelling of 121012212020 in words is "one hundred twenty-one billion, twelve million, two hundred twelve thousand, twenty".