2102256642 has 16 divisors (see below), whose sum is σ = 4216564800. Its totient is φ = 698743632.

The previous prime is 2102256641. The next prime is 2102256697. The reversal of 2102256642 is 2466522012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2102256641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499878 + ... + 504065.

It is an arithmetic number, because the mean of its divisors is an integer number (263535300).

Almost surely, 2^2102256642 is an apocalyptic number.

2102256642 is an abundant number, since it is smaller than the sum of its proper divisors (2114308158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2102256642 is a wasteful number, since it uses less digits than its factorization.

2102256642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004297.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2102256642 is about 45850.3723212800. The cubic root of 2102256642 is about 1281.0377005787.

Adding to 2102256642 its reverse (2466522012), we get a palindrome (4568778654).

The spelling of 2102256642 in words is "two billion, one hundred two million, two hundred fifty-six thousand, six hundred forty-two".