21420103402 has 8 divisors (see below), whose sum is σ = 32570294436. Its totient is φ = 10563338592.

The previous prime is 21420103399. The next prime is 21420103409. The reversal of 21420103402 is 20430102412.

It can be written as a sum of positive squares in 2 ways, for example, as 21115286721 + 304816681 = 145311^2 + 17459^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21420103402.

It is not an unprimeable number, because it can be changed into a prime (21420103409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73356373 + ... + 73356664.

Almost surely, 2^21420103402 is an apocalyptic number.

21420103402 is a deficient number, since it is larger than the sum of its proper divisors (11150191034).

21420103402 is a wasteful number, since it uses less digits than its factorization.

21420103402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146713112.

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

Adding to 21420103402 its reverse (20430102412), we get a palindrome (41850205814).

It can be divided in two parts, 2142010 and 3402, that added together give a palindrome (2145412).

The spelling of 21420103402 in words is "twenty-one billion, four hundred twenty million, one hundred three thousand, four hundred two".