21123213310 has 16 divisors (see below), whose sum is σ = 38024640000. Its totient is φ = 8448650656.

The previous prime is 21123213263. The next prime is 21123213329. The reversal of 21123213310 is 1331232112.

It is a super-2 number, since 2×21123213310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 74691 + ... + 218689.

It is an arithmetic number, because the mean of its divisors is an integer number (2376540000).

Almost surely, 2^21123213310 is an apocalyptic number.

21123213310 is a deficient number, since it is larger than the sum of its proper divisors (16901426690).

21123213310 is a wasteful number, since it uses less digits than its factorization.

21123213310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158675.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21123213310 its reverse (1331232112), we get a palindrome (22454445422).

The spelling of 21123213310 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirteen thousand, three hundred ten".