101220102101021 has 4 divisors (see below), whose sum is σ = 102357406619100. Its totient is φ = 100082797582944.

The previous prime is 101220102100937. The next prime is 101220102101159. The reversal of 101220102101021 is 120101201022101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9266002968121 + 91954099132900 = 3044011^2 + 9589270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101220102101021 is a prime.

It is a super-2 number, since 2×101220102101021² (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 = 101220102100987 and 101220102101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220102100021) 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, 568652258906 + ... + 568652259083.

It is an arithmetic number, because the mean of its divisors is an integer number (25589351654775).

Almost surely, 2^{101220102101021} is an apocalyptic number.

It is an amenable number.

101220102101021 is a deficient number, since it is larger than the sum of its proper divisors (1137304518079).

101220102101021 is an equidigital number, since it uses as much as digits as its factorization.

101220102101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137304518078.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 101220102101021 its reverse (120101201022101), we get a palindrome (221321303123122).

The spelling of 101220102101021 in words is "one hundred one trillion, two hundred twenty billion, one hundred two million, one hundred one thousand, twenty-one".