21112022212021 has 4 divisors (see below), whose sum is σ = 22736023920652. Its totient is φ = 19488020503392.

The previous prime is 21112022212019. The next prime is 21112022212051. The reversal of 21112022212021 is 12021222021112.

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 3478825555921 + 17633196656100 = 1865161^2 + 4199190^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112022212021 - 2¹ = 21112022212019 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 21112022212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112022212051) 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, 812000854296 + ... + 812000854321.

It is an arithmetic number, because the mean of its divisors is an integer number (5684005980163).

Almost surely, 2^{21112022212021} is an apocalyptic number.

It is an amenable number.

21112022212021 is a deficient number, since it is larger than the sum of its proper divisors (1624001708631).

21112022212021 is a wasteful number, since it uses less digits than its factorization.

21112022212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624001708630.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112022212021 its reverse (12021222021112), we get a palindrome (33133244233133).

The spelling of 21112022212021 in words is "twenty-one trillion, one hundred twelve billion, twenty-two million, two hundred twelve thousand, twenty-one".