21011121310 has 16 divisors (see below), whose sum is σ = 39810546000. Its totient is φ = 7962109056.

The previous prime is 21011121301. The next prime is 21011121331. The reversal of 21011121310 is 1312111012.

It is a happy number.

It is a super-2 number, since 2×21011121310² (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, 55292235 + ... + 55292614.

It is an arithmetic number, because the mean of its divisors is an integer number (2488159125).

Almost surely, 2^21011121310 is an apocalyptic number.

21011121310 is a deficient number, since it is larger than the sum of its proper divisors (18799424690).

21011121310 is a wasteful number, since it uses less digits than its factorization.

21011121310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110584875.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21011121310 its reverse (1312111012), we get a palindrome (22323232322).

The spelling of 21011121310 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, three hundred ten".