21022101221211 has 24 divisors (see below), whose sum is σ = 32154332234544. Its totient is φ = 13189155125760.

The previous prime is 21022101221179. The next prime is 21022101221237. The reversal of 21022101221211 is 11212210122012.

21022101221211 is a `hidden beast` number, since 2 + 10 + 221 + 0 + 1 + 221 + 211 = 666.

It is not a de Polignac number, because 21022101221211 - 2⁵ = 21022101221179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022101221281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4447701 + ... + 7862966.

It is an arithmetic number, because the mean of its divisors is an integer number (1339763843106).

Almost surely, 2^{21022101221211} is an apocalyptic number.

21022101221211 is a deficient number, since it is larger than the sum of its proper divisors (11132231013333).

21022101221211 is a wasteful number, since it uses less digits than its factorization.

21022101221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321851 (or 12321848 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21022101221211 its reverse (11212210122012), we get a palindrome (32234311343223).

The spelling of 21022101221211 in words is "twenty-one trillion, twenty-two billion, one hundred one million, two hundred twenty-one thousand, two hundred eleven".