2100022121 has 4 divisors (see below), whose sum is σ = 2223552852. Its totient is φ = 1976491392.

The previous prime is 2100022103. The next prime is 2100022129. The reversal of 2100022121 is 1212200012.

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 1329404521 + 770617600 = 36461^2 + 27760^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100022121 - 2¹⁴ = 2100005737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100022129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61765340 + ... + 61765373.

It is an arithmetic number, because the mean of its divisors is an integer number (555888213).

Almost surely, 2^2100022121 is an apocalyptic number.

It is an amenable number.

2100022121 is a deficient number, since it is larger than the sum of its proper divisors (123530731).

2100022121 is a wasteful number, since it uses less digits than its factorization.

2100022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123530730.

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

The square root of 2100022121 is about 45825.9983088203. The cubic root of 2100022121 is about 1280.5836614307.

Adding to 2100022121 its reverse (1212200012), we get a palindrome (3312222133).

The spelling of 2100022121 in words is "two billion, one hundred million, twenty-two thousand, one hundred twenty-one".