21020322130 has 8 divisors (see below), whose sum is σ = 37836579852. Its totient is φ = 8408128848.

The previous prime is 21020322049. The next prime is 21020322139. The reversal of 21020322130 is 3122302012.

It can be written as a sum of positive squares in 2 ways, for example, as 19852528201 + 1167793929 = 140899^2 + 34173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21020322139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051016097 + ... + 1051016116.

Almost surely, 2^21020322130 is an apocalyptic number.

21020322130 is a deficient number, since it is larger than the sum of its proper divisors (16816257722).

21020322130 is a wasteful number, since it uses less digits than its factorization.

21020322130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102032220.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21020322130 its reverse (3122302012), we get a palindrome (24142624142).

The spelling of 21020322130 in words is "twenty-one billion, twenty million, three hundred twenty-two thousand, one hundred thirty".