21022012022021 has 8 divisors (see below), whose sum is σ = 21347903005440. Its totient is φ = 20696477791968.

The previous prime is 21022012021943. The next prime is 21022012022027. The reversal of 21022012022021 is 12022021022012.

It is a happy number.

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-21022012022021 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 (21022012022027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89069576 + ... + 89305281.

It is an arithmetic number, because the mean of its divisors is an integer number (2668487875680).

Almost surely, 2^{21022012022021} is an apocalyptic number.

It is an amenable number.

21022012022021 is a deficient number, since it is larger than the sum of its proper divisors (325890983419).

21022012022021 is a wasteful number, since it uses less digits than its factorization.

21022012022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178376683.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022012022021 its reverse (12022021022012), we get a palindrome (33044033044033).

The spelling of 21022012022021 in words is "twenty-one trillion, twenty-two billion, twelve million, twenty-two thousand, twenty-one".