21403210402 has 256 divisors, whose sum is σ = 44126208000. Its totient is φ = 7576934400.

The previous prime is 21403210369. The next prime is 21403210403. The reversal of 21403210402 is 20401230412.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21403210402.

It is not an unprimeable number, because it can be changed into a prime (21403210403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 362766249 + ... + 362766307.

It is an arithmetic number, because the mean of its divisors is an integer number (172368000).

Almost surely, 2^21403210402 is an apocalyptic number.

21403210402 is an abundant number, since it is smaller than the sum of its proper divisors (22722997598).

21403210402 is a wasteful number, since it uses less digits than its factorization.

21403210402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

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

Adding to 21403210402 its reverse (20401230412), we get a palindrome (41804440814).

The spelling of 21403210402 in words is "twenty-one billion, four hundred three million, two hundred ten thousand, four hundred two".