21213130030 has 16 divisors (see below), whose sum is σ = 38809596384. Its totient is φ = 8346149280.

The previous prime is 21213130019. The next prime is 21213130031. The reversal of 21213130030 is 3003131212.

It is a junction number, because it is equal to n+sod(n) for n = 21213129986 and 21213130013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213130031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17387202 + ... + 17388421.

It is an arithmetic number, because the mean of its divisors is an integer number (2425599774).

Almost surely, 2^21213130030 is an apocalyptic number.

21213130030 is a deficient number, since it is larger than the sum of its proper divisors (17596466354).

21213130030 is a wasteful number, since it uses less digits than its factorization.

21213130030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34775691.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21213130030 its reverse (3003131212), we get a palindrome (24216261242).

The spelling of 21213130030 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty thousand, thirty".