21130103402 has 4 divisors (see below), whose sum is σ = 31695155106. Its totient is φ = 10565051700.

The previous prime is 21130103399. The next prime is 21130103411. The reversal of 21130103402 is 20430103112.

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., 18735860641 + 2394242761 = 136879^2 + 48931^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282525849 + ... + 5282525852.

Almost surely, 2^21130103402 is an apocalyptic number.

21130103402 is a deficient number, since it is larger than the sum of its proper divisors (10565051704).

21130103402 is a wasteful number, since it uses less digits than its factorization.

21130103402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10565051703.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130103402 its reverse (20430103112), we get a palindrome (41560206514).

The spelling of 21130103402 in words is "twenty-one billion, one hundred thirty million, one hundred three thousand, four hundred two".