2102042030251 has 4 divisors (see below), whose sum is σ = 2153311348104. Its totient is φ = 2050772712400.

The previous prime is 2102042030243. The next prime is 2102042030269. The reversal of 2102042030251 is 1520302402012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2102042030251 - 2³ = 2102042030243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102042033251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25634658865 + ... + 25634658946.

It is an arithmetic number, because the mean of its divisors is an integer number (538327837026).

Almost surely, 2^{2102042030251} is an apocalyptic number.

2102042030251 is a deficient number, since it is larger than the sum of its proper divisors (51269317853).

2102042030251 is an equidigital number, since it uses as much as digits as its factorization.

2102042030251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51269317852.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 2102042030251 its reverse (1520302402012), we get a palindrome (3622344432263).

The spelling of 2102042030251 in words is "two trillion, one hundred two billion, forty-two million, thirty thousand, two hundred fifty-one".