20100122021 has 8 divisors (see below), whose sum is σ = 24180598080. Its totient is φ = 16321903488.

The previous prime is 20100121997. The next prime is 20100122051. The reversal of 20100122021 is 12022100102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20100122021 - 2³⁴ = 2920252837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100121993 and 20100122011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100122051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75564236 + ... + 75564501.

It is an arithmetic number, because the mean of its divisors is an integer number (3022574760).

Almost surely, 2^20100122021 is an apocalyptic number.

It is an amenable number.

20100122021 is a deficient number, since it is larger than the sum of its proper divisors (4080476059).

20100122021 is a wasteful number, since it uses less digits than its factorization.

20100122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151128763.

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

Adding to 20100122021 its reverse (12022100102), we get a palindrome (32122222123).

The spelling of 20100122021 in words is "twenty billion, one hundred million, one hundred twenty-two thousand, twenty-one".