21320213210 has 16 divisors (see below), whose sum is σ = 38380178592. Its totient is φ = 8527242000.

The previous prime is 21320213209. The next prime is 21320213279. The reversal of 21320213210 is 1231202312.

It is a super-3 number, since 3×21320213210³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6425 + ... + 206595.

It is an arithmetic number, because the mean of its divisors is an integer number (2398761162).

Almost surely, 2^21320213210 is an apocalyptic number.

21320213210 is a deficient number, since it is larger than the sum of its proper divisors (17059965382).

21320213210 is a wasteful number, since it uses less digits than its factorization.

21320213210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210829.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21320213210 its reverse (1231202312), we get a palindrome (22551415522).

The spelling of 21320213210 in words is "twenty-one billion, three hundred twenty million, two hundred thirteen thousand, two hundred ten".