21214222402221 has 16 divisors (see below), whose sum is σ = 31428558673920. Its totient is φ = 14142778466400.

The previous prime is 21214222402081. The next prime is 21214222402271. The reversal of 21214222402221 is 12220422241212.

21214222402221 is a `hidden beast` number, since 2 + 1 + 2 + 14 + 2 + 22 + 402 + 221 = 666.

It is not a de Polignac number, because 21214222402221 - 2⁹ = 21214222401709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214222402271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13359121 + ... + 14862521.

It is an arithmetic number, because the mean of its divisors is an integer number (1964284917120).

Almost surely, 2^{21214222402221} is an apocalyptic number.

It is an amenable number.

21214222402221 is a deficient number, since it is larger than the sum of its proper divisors (10214336271699).

21214222402221 is a wasteful number, since it uses less digits than its factorization.

21214222402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026033 (or 2026027 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 21214222402221 its reverse (12220422241212), we get a palindrome (33434644643433).

The spelling of 21214222402221 in words is "twenty-one trillion, two hundred fourteen billion, two hundred twenty-two million, four hundred two thousand, two hundred twenty-one".