20121400402 has 16 divisors (see below), whose sum is σ = 30448802520. Its totient is φ = 9972114048.

The previous prime is 20121400399. The next prime is 20121400427. The reversal of 20121400402 is 20400412102.

It can be written as a sum of positive squares in 4 ways, for example, as 15197711841 + 4923688561 = 123279^2 + 70169^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50088 + ... + 206764.

Almost surely, 2^20121400402 is an apocalyptic number.

20121400402 is a deficient number, since it is larger than the sum of its proper divisors (10327402118).

20121400402 is a wasteful number, since it uses less digits than its factorization.

20121400402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157245.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20121400402 its reverse (20400412102), we get a palindrome (40521812504).

The spelling of 20121400402 in words is "twenty billion, one hundred twenty-one million, four hundred thousand, four hundred two".