21111111310 has 16 divisors (see below), whose sum is σ = 38135236752. Its totient is φ = 8414392000.

The previous prime is 21111111277. The next prime is 21111111313. The reversal of 21111111310 is 1311111112.

It is a super-2 number, since 2×21111111310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111111313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3753616 + ... + 3759235.

It is an arithmetic number, because the mean of its divisors is an integer number (2383452297).

Almost surely, 2^21111111310 is an apocalyptic number.

21111111310 is a deficient number, since it is larger than the sum of its proper divisors (17024125442).

21111111310 is a wasteful number, since it uses less digits than its factorization.

21111111310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513139.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 21111111310 its reverse (1311111112), we get a palindrome (22422222422).

The spelling of 21111111310 in words is "twenty-one billion, one hundred eleven million, one hundred eleven thousand, three hundred ten".