2102420253451 has 32 divisors (see below), whose sum is σ = 2602032076800. Its totient is φ = 1658932154880.

The previous prime is 2102420253443. The next prime is 2102420253511. The reversal of 2102420253451 is 1543520242012.

It is a happy number.

It is not a de Polignac number, because 2102420253451 - 2³ = 2102420253443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102420253551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 728115 + ... + 2176003.

It is an arithmetic number, because the mean of its divisors is an integer number (81313502400).

Almost surely, 2^{2102420253451} is an apocalyptic number.

2102420253451 is a deficient number, since it is larger than the sum of its proper divisors (499611823349).

2102420253451 is a wasteful number, since it uses less digits than its factorization.

2102420253451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448259.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 2102420253451 its reverse (1543520242012), we get a palindrome (3645940495463).

The spelling of 2102420253451 in words is "two trillion, one hundred two billion, four hundred twenty million, two hundred fifty-three thousand, four hundred fifty-one".