121212021020 has 48 divisors (see below), whose sum is σ = 260319830400. Its totient is φ = 47397043200.

The previous prime is 121212021017. The next prime is 121212021023. The reversal of 121212021020 is 20120212121.

It is an interprime number because it is at equal distance from previous prime (121212021017) and next prime (121212021023).

It is a junction number, because it is equal to n+sod(n) for n = 121212020986 and 121212021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220205 + ... + 539364.

It is an arithmetic number, because the mean of its divisors is an integer number (5423329800).

Almost surely, 2^121212021020 is an apocalyptic number.

121212021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212021020 is an abundant number, since it is smaller than the sum of its proper divisors (139107809380).

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

121212021020 is a wasteful number, since it uses less digits than its factorization.

121212021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759758 (or 759756 counting only the distinct ones).

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

Adding to 121212021020 its reverse (20120212121), we get a palindrome (141332233141).

The spelling of 121212021020 in words is "one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, twenty".