21100022210 has 32 divisors (see below), whose sum is σ = 39659621760. Its totient is φ = 8067292288.

The previous prime is 21100022173. The next prime is 21100022263. The reversal of 21100022210 is 1222000112.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21100022191 and 21100022200.

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, 297581 + ... + 361599.

It is an arithmetic number, because the mean of its divisors is an integer number (1239363180).

Almost surely, 2^21100022210 is an apocalyptic number.

21100022210 is a deficient number, since it is larger than the sum of its proper divisors (18559599550).

21100022210 is a wasteful number, since it uses less digits than its factorization.

21100022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65482.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100022210 its reverse (1222000112), we get a palindrome (22322022322).

The spelling of 21100022210 in words is "twenty-one billion, one hundred million, twenty-two thousand, two hundred ten".