2100121402 has 16 divisors (see below), whose sum is σ = 3218796000. Its totient is φ = 1027358640.

The previous prime is 2100121399. The next prime is 2100121409. The reversal of 2100121402 is 2041210012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2100121409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17277 + ... + 67072.

It is an arithmetic number, because the mean of its divisors is an integer number (201174750).

Almost surely, 2^2100121402 is an apocalyptic number.

2100121402 is a deficient number, since it is larger than the sum of its proper divisors (1118674598).

2100121402 is a wasteful number, since it uses less digits than its factorization.

2100121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84621.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2100121402 is about 45827.0815348305. The cubic root of 2100121402 is about 1280.6038414758.

Adding to 2100121402 its reverse (2041210012), we get a palindrome (4141331414).

The spelling of 2100121402 in words is "two billion, one hundred million, one hundred twenty-one thousand, four hundred two".