2021012212121 has 8 divisors (see below), whose sum is σ = 2310238941504. Its totient is φ = 1731913157520.

The previous prime is 2021012212099. The next prime is 2021012212159. The reversal of 2021012212121 is 1212122101202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2021012212121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021012212121.

It is not an unprimeable number, because it can be changed into a prime (2021012812121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31884770 + ... + 31948091.

It is an arithmetic number, because the mean of its divisors is an integer number (288779867688).

Almost surely, 2^{2021012212121} is an apocalyptic number.

It is an amenable number.

2021012212121 is a deficient number, since it is larger than the sum of its proper divisors (289226729383).

2021012212121 is an equidigital number, since it uses as much as digits as its factorization.

2021012212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63837391.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2021012212121 its reverse (1212122101202), we get a palindrome (3233134313323).

The spelling of 2021012212121 in words is "two trillion, twenty-one billion, twelve million, two hundred twelve thousand, one hundred twenty-one".