21221011022101 has 16 divisors (see below), whose sum is σ = 23350037466816. Its totient is φ = 19284786642000.

The previous prime is 21221011022093. The next prime is 21221011022147. The reversal of 21221011022101 is 10122011012212.

It is not a de Polignac number, because 21221011022101 - 2³ = 21221011022093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221011022161) 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, 739906 + ... + 6556636.

It is an arithmetic number, because the mean of its divisors is an integer number (1459377341676).

Almost surely, 2^{21221011022101} is an apocalyptic number.

It is an amenable number.

21221011022101 is a deficient number, since it is larger than the sum of its proper divisors (2129026444715).

21221011022101 is an equidigital number, since it uses as much as digits as its factorization.

21221011022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819505 (or 5819483 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221011022101 its reverse (10122011012212), we get a palindrome (31343022034313).

The spelling of 21221011022101 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, twenty-two thousand, one hundred one".