21122021211 has 8 divisors (see below), whose sum is σ = 29133822480. Its totient is φ = 13595783712.

The previous prime is 21122021197. The next prime is 21122021233. The reversal of 21122021211 is 11212022112.

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

It is not a de Polignac number, because 21122021211 - 2⁶ = 21122021147 is a prime.

It is a super-2 number, since 2×21122021211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122021911) 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, 121390840 + ... + 121391013.

It is an arithmetic number, because the mean of its divisors is an integer number (3641727810).

Almost surely, 2^21122021211 is an apocalyptic number.

21122021211 is a deficient number, since it is larger than the sum of its proper divisors (8011801269).

21122021211 is a wasteful number, since it uses less digits than its factorization.

21122021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242781885.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122021211 its reverse (11212022112), we get a palindrome (32334043323).

Subtracting from 21122021211 its reverse (11212022112), we obtain a palindrome (9909999099).

The spelling of 21122021211 in words is "twenty-one billion, one hundred twenty-two million, twenty-one thousand, two hundred eleven".