100201021220021 has 4 divisors (see below), whose sum is σ = 100214329903500. Its totient is φ = 100187712536544.

The previous prime is 100201021219969. The next prime is 100201021220063. The reversal of 100201021220021 is 120022120102001.

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 13419686297521 + 86781334922500 = 3663289^2 + 9315650^2 .

It is a cyclic number.

It is not a de Polignac number, because 100201021220021 - 2¹⁰ = 100201021218997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100201021219978 and 100201021220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100201021222021) 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, 6654330446 + ... + 6654345503.

It is an arithmetic number, because the mean of its divisors is an integer number (25053582475875).

Almost surely, 2^{100201021220021} is an apocalyptic number.

It is an amenable number.

100201021220021 is a deficient number, since it is larger than the sum of its proper divisors (13308683479).

100201021220021 is an equidigital number, since it uses as much as digits as its factorization.

100201021220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13308683478.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100201021220021 its reverse (120022120102001), we get a palindrome (220223141322022).

The spelling of 100201021220021 in words is "one hundred trillion, two hundred one billion, twenty-one million, two hundred twenty thousand, twenty-one".