21431313030 has 64 divisors (see below), whose sum is σ = 52053865920. Its totient is φ = 5646372864.

The previous prime is 21431313019. The next prime is 21431313031. The reversal of 21431313030 is 3031313412.

It is a junction number, because it is equal to n+sod(n) for n = 21431312988 and 21431313006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431313031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4742332 + ... + 4746848.

It is an arithmetic number, because the mean of its divisors is an integer number (813341655).

Almost surely, 2^21431313030 is an apocalyptic number.

21431313030 is an abundant number, since it is smaller than the sum of its proper divisors (30622552890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431313030 is a wasteful number, since it uses less digits than its factorization.

21431313030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21431313030 its reverse (3031313412), we get a palindrome (24462626442).

The spelling of 21431313030 in words is "twenty-one billion, four hundred thirty-one million, three hundred thirteen thousand, thirty".