21420130402 has 16 divisors (see below), whose sum is σ = 35058616992. Its totient is φ = 9734341120.

The previous prime is 21420130327. The next prime is 21420130411. The reversal of 21420130402 is 20403102412.

It is a self number, because there is not a number n which added to its sum of digits gives 21420130402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3618 + ... + 207010.

It is an arithmetic number, because the mean of its divisors is an integer number (2191163562).

Almost surely, 2^21420130402 is an apocalyptic number.

21420130402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420130402 is a deficient number, since it is larger than the sum of its proper divisors (13638486590).

21420130402 is a wasteful number, since it uses less digits than its factorization.

21420130402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208193.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21420130402 its reverse (20403102412), we get a palindrome (41823232814).

The spelling of 21420130402 in words is "twenty-one billion, four hundred twenty million, one hundred thirty thousand, four hundred two".