21420311402 has 8 divisors (see below), whose sum is σ = 36720533856. Its totient is φ = 9180133452.

The previous prime is 21420311387. The next prime is 21420311449. The reversal of 21420311402 is 20411302412.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765011108 + ... + 765011135.

It is an arithmetic number, because the mean of its divisors is an integer number (4590066732).

Almost surely, 2^21420311402 is an apocalyptic number.

21420311402 is a deficient number, since it is larger than the sum of its proper divisors (15300222454).

21420311402 is a wasteful number, since it uses less digits than its factorization.

21420311402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530022252.

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

Adding to 21420311402 its reverse (20411302412), we get a palindrome (41831613814).

The spelling of 21420311402 in words is "twenty-one billion, four hundred twenty million, three hundred eleven thousand, four hundred two".