21320310030 has 64 divisors (see below), whose sum is σ = 51708561408. Its totient is φ = 5625607680.

The previous prime is 21320310017. The next prime is 21320310031. The reversal of 21320310030 is 3001302312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 21320309991 and 21320310009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320310031) 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, 2134107 + ... + 2144073.

It is an arithmetic number, because the mean of its divisors is an integer number (807946272).

Almost surely, 2^21320310030 is an apocalyptic number.

21320310030 is an abundant number, since it is smaller than the sum of its proper divisors (30388251378).

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

21320310030 is a wasteful number, since it uses less digits than its factorization.

21320310030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10721.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21320310030 its reverse (3001302312), we get a palindrome (24321612342).

The spelling of 21320310030 in words is "twenty-one billion, three hundred twenty million, three hundred ten thousand, thirty".