21134012402 has 4 divisors (see below), whose sum is σ = 31701018606. Its totient is φ = 10567006200.

The previous prime is 21134012401. The next prime is 21134012521. The reversal of 21134012402 is 20421043112.

21134012402 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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., 21112380601 + 21631801 = 145301^2 + 4651^2 .

It is not an unprimeable number, because it can be changed into a prime (21134012401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283503099 + ... + 5283503102.

Almost surely, 2^21134012402 is an apocalyptic number.

21134012402 is a deficient number, since it is larger than the sum of its proper divisors (10567006204).

21134012402 is a wasteful number, since it uses less digits than its factorization.

21134012402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10567006203.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21134012402 its reverse (20421043112), we get a palindrome (41555055514).

The spelling of 21134012402 in words is "twenty-one billion, one hundred thirty-four million, twelve thousand, four hundred two".