21122112001021 has 4 divisors (see below), whose sum is σ = 21283349497344. Its totient is φ = 20960874504700.

The previous prime is 21122112000967. The next prime is 21122112001049. The reversal of 21122112001021 is 12010021122112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21122112001021 - 2¹³ = 21122111992829 is a prime.

It is a super-2 number, since 2×21122112001021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122112000986 and 21122112001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122112031021) 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, 80618747965 + ... + 80618748226.

It is an arithmetic number, because the mean of its divisors is an integer number (5320837374336).

Almost surely, 2^{21122112001021} is an apocalyptic number.

It is an amenable number.

21122112001021 is a deficient number, since it is larger than the sum of its proper divisors (161237496323).

21122112001021 is a wasteful number, since it uses less digits than its factorization.

21122112001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161237496322.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122112001021 its reverse (12010021122112), we get a palindrome (33132133123133).

The spelling of 21122112001021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, one thousand, twenty-one".