101220101021 has 12 divisors (see below), whose sum is σ = 109676514528. Its totient is φ = 93373145424.

The previous prime is 101220101009. The next prime is 101220101053. The reversal of 101220101021 is 120101022101.

It is a de Polignac number, because none of the positive numbers 2^k-101220101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220100993 and 101220101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220101821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66686 + ... + 454848.

It is an arithmetic number, because the mean of its divisors is an integer number (9139709544).

Almost surely, 2^101220101021 is an apocalyptic number.

It is an amenable number.

101220101021 is a deficient number, since it is larger than the sum of its proper divisors (8456413507).

101220101021 is a wasteful number, since it uses less digits than its factorization.

101220101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389732 (or 389719 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101220101021 its reverse (120101022101), we get a palindrome (221321123122).

The spelling of 101220101021 in words is "one hundred one billion, two hundred twenty million, one hundred one thousand, twenty-one".