21220211221023 has 16 divisors (see below), whose sum is σ = 28390692185856. Its totient is φ = 14098284829440.

The previous prime is 21220211220997. The next prime is 21220211221031. The reversal of 21220211221023 is 32012211202212.

It is not a de Polignac number, because 21220211221023 - 2⁹ = 21220211220511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220211221043) 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, 3334063 + ... + 7318223.

It is an arithmetic number, because the mean of its divisors is an integer number (1774418261616).

Almost surely, 2^{21220211221023} is an apocalyptic number.

21220211221023 is a deficient number, since it is larger than the sum of its proper divisors (7170480964833).

21220211221023 is a wasteful number, since it uses less digits than its factorization.

21220211221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990254.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21220211221023 its reverse (32012211202212), we get a palindrome (53232422423235).

The spelling of 21220211221023 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, twenty-three".