2100040402 has 4 divisors (see below), whose sum is σ = 3150060606. Its totient is φ = 1050020200.

The previous prime is 2100040399. The next prime is 2100040441. The reversal of 2100040402 is 2040400012.

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

It can be written as a sum of positive squares in only one way, i.e., 1376484201 + 723556201 = 37101^2 + 26899^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525010099 + ... + 525010102.

Almost surely, 2^2100040402 is an apocalyptic number.

2100040402 is a deficient number, since it is larger than the sum of its proper divisors (1050020204).

2100040402 is a wasteful number, since it uses less digits than its factorization.

2100040402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050020203.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2100040402 is about 45826.1977693982. The cubic root of 2100040402 is about 1280.5873773093.

Adding to 2100040402 its reverse (2040400012), we get a palindrome (4140440414).

The spelling of 2100040402 in words is "two billion, one hundred million, forty thousand, four hundred two".