21321420350 has 24 divisors (see below), whose sum is σ = 40406108040. Its totient is φ = 8367650720.

The previous prime is 21321420313. The next prime is 21321420359. The reversal of 21321420350 is 5302412312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321420359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4020260 + ... + 4025559.

It is an arithmetic number, because the mean of its divisors is an integer number (1683587835).

Almost surely, 2^21321420350 is an apocalyptic number.

21321420350 is a deficient number, since it is larger than the sum of its proper divisors (19084687690).

21321420350 is a wasteful number, since it uses less digits than its factorization.

21321420350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045884 (or 8045879 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21321420350 its reverse (5302412312), we get a palindrome (26623832662).

The spelling of 21321420350 in words is "twenty-one billion, three hundred twenty-one million, four hundred twenty thousand, three hundred fifty".