2111321012021 has 4 divisors (see below), whose sum is σ = 2273730320652. Its totient is φ = 1948911703392.

The previous prime is 2111321011991. The next prime is 2111321012029. The reversal of 2111321012021 is 1202101231112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172263109521 + 939057902500 = 1082711^2 + 969050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111321012021 - 2³⁴ = 2094141142837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111321012029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81204654296 + ... + 81204654321.

It is an arithmetic number, because the mean of its divisors is an integer number (568432580163).

Almost surely, 2^{2111321012021} is an apocalyptic number.

It is an amenable number.

2111321012021 is a deficient number, since it is larger than the sum of its proper divisors (162409308631).

2111321012021 is a wasteful number, since it uses less digits than its factorization.

2111321012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162409308630.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2111321012021 its reverse (1202101231112), we get a palindrome (3313422243133).

The spelling of 2111321012021 in words is "two trillion, one hundred eleven billion, three hundred twenty-one million, twelve thousand, twenty-one".