21120222212021 has 8 divisors (see below), whose sum is σ = 21569716798464. Its totient is φ = 20670732965520.

The previous prime is 21120222211969. The next prime is 21120222212069. The reversal of 21120222212021 is 12021222202112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120222212021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120222211984 and 21120222212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222212081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7239311 + ... + 9728723.

It is an arithmetic number, because the mean of its divisors is an integer number (2696214599808).

Almost surely, 2^{21120222212021} is an apocalyptic number.

It is an amenable number.

21120222212021 is a deficient number, since it is larger than the sum of its proper divisors (449494586443).

21120222212021 is a wasteful number, since it uses less digits than its factorization.

21120222212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669971.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21120222212021 its reverse (12021222202112), we get a palindrome (33141444414133).

Subtracting from 21120222212021 its reverse (12021222202112), we obtain a palindrome (9099000009909).

The spelling of 21120222212021 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".