21111101210 has 32 divisors (see below), whose sum is σ = 40018397760. Its totient is φ = 7996313088.

The previous prime is 21111101201. The next prime is 21111101213. The reversal of 21111101210 is 1210111112.

It is a junction number, because it is equal to n+sod(n) for n = 21111101191 and 21111101200.

It is not an unprimeable number, because it can be changed into a prime (21111101213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407429 + ... + 456311.

It is an arithmetic number, because the mean of its divisors is an integer number (1250574930).

Almost surely, 2^21111101210 is an apocalyptic number.

21111101210 is a deficient number, since it is larger than the sum of its proper divisors (18907296550).

21111101210 is a wasteful number, since it uses less digits than its factorization.

21111101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51182.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111101210 its reverse (1210111112), we get a palindrome (22321212322).

The spelling of 21111101210 in words is "twenty-one billion, one hundred eleven million, one hundred one thousand, two hundred ten".