21214213202021 has 4 divisors (see below), whose sum is σ = 24244815088032. Its totient is φ = 18183611316012.

The previous prime is 21214213201963. The next prime is 21214213202033. The reversal of 21214213202021 is 12020231241212.

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 21214213202021 - 2³⁸ = 20939335295077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214213202921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515300942995 + ... + 1515300943008.

It is an arithmetic number, because the mean of its divisors is an integer number (6061203772008).

Almost surely, 2^{21214213202021} is an apocalyptic number.

It is an amenable number.

21214213202021 is a deficient number, since it is larger than the sum of its proper divisors (3030601886011).

21214213202021 is an equidigital number, since it uses as much as digits as its factorization.

21214213202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030601886010.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21214213202021 its reverse (12020231241212), we get a palindrome (33234444443233).

The spelling of 21214213202021 in words is "twenty-one trillion, two hundred fourteen billion, two hundred thirteen million, two hundred two thousand, twenty-one".