20421212402 has 8 divisors (see below), whose sum is σ = 31688088300. Its totient is φ = 9858516304.

The previous prime is 20421212401. The next prime is 20421212417.

20421212402 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 18919727401 + 1501485001 = 137549^2 + 38749^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20421212401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176044877 + ... + 176044992.

Almost surely, 2^20421212402 is an apocalyptic number.

20421212402 is a deficient number, since it is larger than the sum of its proper divisors (11266875898).

20421212402 is a wasteful number, since it uses less digits than its factorization.

20421212402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352089900.

The product of its (nonzero) digits is 512, while the sum is 20.

The spelling of 20421212402 in words is "twenty billion, four hundred twenty-one million, two hundred twelve thousand, four hundred two".