21313020030 has 32 divisors (see below), whose sum is σ = 51188765184. Its totient is φ = 5679303456.

The previous prime is 21313020019. The next prime is 21313020041. The reversal of 21313020030 is 3002031312.

It is an interprime number because it is at equal distance from previous prime (21313020019) and next prime (21313020041).

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 = 21313019991 and 21313020009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218842 + ... + 300861.

It is an arithmetic number, because the mean of its divisors is an integer number (1599648912).

Almost surely, 2^21313020030 is an apocalyptic number.

21313020030 is an abundant number, since it is smaller than the sum of its proper divisors (29875745154).

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

21313020030 is a wasteful number, since it uses less digits than its factorization.

21313020030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521080.

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

Adding to 21313020030 its reverse (3002031312), we get a palindrome (24315051342).

The spelling of 21313020030 in words is "twenty-one billion, three hundred thirteen million, twenty thousand, thirty".