2123210121 has 16 divisors (see below), whose sum is σ = 3003980544. Its totient is φ = 1329318144.

The previous prime is 2123210113. The next prime is 2123210123. The reversal of 2123210121 is 1210123212.

2123210121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 2123210121 - 2³ = 2123210113 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2123210121.

It is not an unprimeable number, because it can be changed into a prime (2123210123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21346 + ... + 68571.

It is an arithmetic number, because the mean of its divisors is an integer number (187748784).

Almost surely, 2^2123210121 is an apocalyptic number.

It is an amenable number.

2123210121 is a deficient number, since it is larger than the sum of its proper divisors (880770423).

2123210121 is a wasteful number, since it uses less digits than its factorization.

2123210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90400.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2123210121 is about 46078.3042331204. The cubic root of 2123210121 is about 1285.2797305692.

Adding to 2123210121 its reverse (1210123212), we get a palindrome (3333333333).

The spelling of 2123210121 in words is "two billion, one hundred twenty-three million, two hundred ten thousand, one hundred twenty-one".