2021121221013 has 16 divisors (see below), whose sum is σ = 3170386229760. Its totient is φ = 1268154491328.

The previous prime is 2021121221011. The next prime is 2021121221029. The reversal of 2021121221013 is 3101221211202.

2021121221013 is a `hidden beast` number, since 20 + 211 + 212 + 210 + 13 = 666.

It is not a de Polignac number, because 2021121221013 - 2¹ = 2021121221011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121221011) 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, 2201656645 + ... + 2201657562.

It is an arithmetic number, because the mean of its divisors is an integer number (198149139360).

Almost surely, 2^{2021121221013} is an apocalyptic number.

It is an amenable number.

2021121221013 is a deficient number, since it is larger than the sum of its proper divisors (1149265008747).

2021121221013 is a wasteful number, since it uses less digits than its factorization.

2021121221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403314233 (or 4403314227 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 2021121221013 its reverse (3101221211202), we get a palindrome (5122342432215).

The spelling of 2021121221013 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, thirteen".