20100122001 has 32 divisors (see below), whose sum is σ = 30463136000. Its totient is φ = 13095126144.

The previous prime is 20100121997. The next prime is 20100122051. The reversal of 20100122001 is 10022100102.

It is not a de Polignac number, because 20100122001 - 2² = 20100121997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168060 + ... + 261618.

It is an arithmetic number, because the mean of its divisors is an integer number (951973000).

Almost surely, 2^20100122001 is an apocalyptic number.

It is an amenable number.

20100122001 is a deficient number, since it is larger than the sum of its proper divisors (10363013999).

20100122001 is a wasteful number, since it uses less digits than its factorization.

20100122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93750 (or 93744 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20100122001 its reverse (10022100102), we get a palindrome (30122222103).

The spelling of 20100122001 in words is "twenty billion, one hundred million, one hundred twenty-two thousand, one".