21221314211 has 8 divisors (see below), whose sum is σ = 21558850560. Its totient is φ = 20884389768.

The previous prime is 21221314193. The next prime is 21221314229. The reversal of 21221314211 is 11241312212.

It is an interprime number because it is at equal distance from previous prime (21221314193) and next prime (21221314229).

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

It is a cyclic number.

It is not a de Polignac number, because 21221314211 - 2¹⁸ = 21221052067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221314811) 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, 82811 + ... + 222036.

It is an arithmetic number, because the mean of its divisors is an integer number (2694856320).

Almost surely, 2^21221314211 is an apocalyptic number.

21221314211 is a deficient number, since it is larger than the sum of its proper divisors (337536349).

21221314211 is a wasteful number, since it uses less digits than its factorization.

21221314211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305953.

The product of its digits is 192, while the sum is 20.

Adding to 21221314211 its reverse (11241312212), we get a palindrome (32462626423).

The spelling of 21221314211 in words is "twenty-one billion, two hundred twenty-one million, three hundred fourteen thousand, two hundred eleven".