2121400202 has 4 divisors (see below), whose sum is σ = 3182100306. Its totient is φ = 1060700100.

The previous prime is 2121400187. The next prime is 2121400243. The reversal of 2121400202 is 2020041212.

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., 1657385521 + 464014681 = 40711^2 + 21541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530350049 + ... + 530350052.

Almost surely, 2^2121400202 is an apocalyptic number.

2121400202 is a deficient number, since it is larger than the sum of its proper divisors (1060700104).

2121400202 is a wasteful number, since it uses less digits than its factorization.

2121400202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060700103.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2121400202 is about 46058.6604451324. The cubic root of 2121400202 is about 1284.9144168248.

Adding to 2121400202 its reverse (2020041212), we get a palindrome (4141441414).

The spelling of 2121400202 in words is "two billion, one hundred twenty-one million, four hundred thousand, two hundred two".