100220022100021 has 4 divisors (see below), whose sum is σ = 100223267492844. Its totient is φ = 100216776707200.

The previous prime is 100220022100019. The next prime is 100220022100057. The reversal of 100220022100021 is 120001220022001.

It is a happy number.

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 93147688203025 + 7072333896996 = 9651305^2 + 2659386^2 .

It is a cyclic number.

It is not a de Polignac number, because 100220022100021 - 2¹ = 100220022100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100220022099974 and 100220022100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100220022100001) 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, 1622650090 + ... + 1622711851.

It is an arithmetic number, because the mean of its divisors is an integer number (25055816873211).

Almost surely, 2^{100220022100021} is an apocalyptic number.

It is an amenable number.

100220022100021 is a deficient number, since it is larger than the sum of its proper divisors (3245392823).

100220022100021 is an equidigital number, since it uses as much as digits as its factorization.

100220022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245392822.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 100220022100021 its reverse (120001220022001), we get a palindrome (220221242122022).

The spelling of 100220022100021 in words is "one hundred trillion, two hundred twenty billion, twenty-two million, one hundred thousand, twenty-one".