21123201310 has 32 divisors (see below), whose sum is σ = 38189740032. Its totient is φ = 8412037920.

The previous prime is 21123201289. The next prime is 21123201343. The reversal of 21123201310 is 1310232112.

It is a super-2 number, since 2×21123201310² (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 15 ways as a sum of consecutive naturals, for example, 2152515 + ... + 2162305.

It is an arithmetic number, because the mean of its divisors is an integer number (1193429376).

Almost surely, 2^21123201310 is an apocalyptic number.

21123201310 is a deficient number, since it is larger than the sum of its proper divisors (17066538722).

21123201310 is a wasteful number, since it uses less digits than its factorization.

21123201310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10728.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123201310 its reverse (1310232112), we get a palindrome (22433433422).

The spelling of 21123201310 in words is "twenty-one billion, one hundred twenty-three million, two hundred one thousand, three hundred ten".