21214220462021 has 2 divisors, whose sum is σ = 21214220462022. Its totient is φ = 21214220462020.

The previous prime is 21214220462009. The next prime is 21214220462041. The reversal of 21214220462021 is 12026402241212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14004726959521 + 7209493502500 = 3742289^2 + 2685050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214220462021 is a prime.

It is a super-2 number, since 2×21214220462021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214220462041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607110231010 + 10607110231011.

It is an arithmetic number, because the mean of its divisors is an integer number (10607110231011).

Almost surely, 2^{21214220462021} is an apocalyptic number.

It is an amenable number.

21214220462021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214220462021 is an equidigital number, since it uses as much as digits as its factorization.

21214220462021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

The spelling of 21214220462021 in words is "twenty-one trillion, two hundred fourteen billion, two hundred twenty million, four hundred sixty-two thousand, twenty-one".