100220210021 has 4 divisors (see below), whose sum is σ = 100221450732. Its totient is φ = 100218969312.

The previous prime is 100220210011. The next prime is 100220210023. The reversal of 100220210021 is 120012022001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120012022001 = 79 ⋅1519139519.

It can be written as a sum of positive squares in 2 ways, for example, as 18200977921 + 82019232100 = 134911^2 + 286390^2 .

It is a cyclic number.

It is not a de Polignac number, because 100220210021 - 2¹⁴ = 100220193637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100220209984 and 100220210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100220210023) 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, 490070 + ... + 663783.

It is an arithmetic number, because the mean of its divisors is an integer number (25055362683).

Almost surely, 2^100220210021 is an apocalyptic number.

It is an amenable number.

100220210021 is a deficient number, since it is larger than the sum of its proper divisors (1240711).

100220210021 is an equidigital number, since it uses as much as digits as its factorization.

100220210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240710.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100220210021 its reverse (120012022001), we get a palindrome (220232232022).

The spelling of 100220210021 in words is "one hundred billion, two hundred twenty million, two hundred ten thousand, twenty-one".