20010122121 has 32 divisors (see below), whose sum is σ = 29421434880. Its totient is φ = 11995992000.

The previous prime is 20010122117. The next prime is 20010122131. The reversal of 20010122121 is 12122101002.

It is not a de Polignac number, because 20010122121 - 2² = 20010122117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010122097 and 20010122106.

It is not an unprimeable number, because it can be changed into a prime (20010122101) 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, 4740750 + ... + 4744968.

It is an arithmetic number, because the mean of its divisors is an integer number (919419840).

Almost surely, 2^20010122121 is an apocalyptic number.

It is an amenable number.

20010122121 is a deficient number, since it is larger than the sum of its proper divisors (9411312759).

20010122121 is a wasteful number, since it uses less digits than its factorization.

20010122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5757.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20010122121 its reverse (12122101002), we get a palindrome (32132223123).

It can be divided in two parts, 200101 and 22121, that added together give a palindrome (222222).

The spelling of 20010122121 in words is "twenty billion, ten million, one hundred twenty-two thousand, one hundred twenty-one".