101220220021221 has 20 divisors (see below), whose sum is σ = 172806301553952. Its totient is φ = 57840125726088.

The previous prime is 101220220021183. The next prime is 101220220021231. The reversal of 101220220021221 is 122120022022101.

It is a happy number.

101220220021221 is a `hidden beast` number, since 1 + 0 + 1 + 220 + 2 + 200 + 21 + 221 = 666.

It is not a de Polignac number, because 101220220021221 - 2¹¹ = 101220220019173 is a prime.

It is a super-2 number, since 2×101220220021221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101220220021194 and 101220220021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220220021231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 89259452715 + ... + 89259453848.

Almost surely, 2^{101220220021221} is an apocalyptic number.

It is an amenable number.

101220220021221 is a deficient number, since it is larger than the sum of its proper divisors (71586081532731).

101220220021221 is an equidigital number, since it uses as much as digits as its factorization.

101220220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178518906582 (or 178518906573 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 101220220021221 its reverse (122120022022101), we get a palindrome (223340242043322).

The spelling of 101220220021221 in words is "one hundred one trillion, two hundred twenty billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".