101220220021021 has 4 divisors (see below), whose sum is σ = 101220240157632. Its totient is φ = 101220199884412.

The previous prime is 101220220020961. The next prime is 101220220021043. The reversal of 101220220021021 is 120120022022101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101220220021021 - 2⁷ = 101220220020893 is a prime.

It is a super-2 number, since 2×101220220021021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220220020986 and 101220220021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220220021121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4452150 + ... + 14908456.

It is an arithmetic number, because the mean of its divisors is an integer number (25305060039408).

Almost surely, 2^{101220220021021} is an apocalyptic number.

It is an amenable number.

101220220021021 is a deficient number, since it is larger than the sum of its proper divisors (20136611).

101220220021021 is an equidigital number, since it uses as much as digits as its factorization.

101220220021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20136610.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 101220220021021 its reverse (120120022022101), we get a palindrome (221340242043122).

The spelling of 101220220021021 in words is "one hundred one trillion, two hundred twenty billion, two hundred twenty million, twenty-one thousand, twenty-one".