21221021110 has 8 divisors (see below), whose sum is σ = 38197838016. Its totient is φ = 8488408440.

The previous prime is 21221021021. The next prime is 21221021113. The reversal of 21221021110 is 1112012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221021113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061051046 + ... + 1061051065.

It is an arithmetic number, because the mean of its divisors is an integer number (4774729752).

Almost surely, 2^21221021110 is an apocalyptic number.

21221021110 is a deficient number, since it is larger than the sum of its proper divisors (16976816906).

21221021110 is a wasteful number, since it uses less digits than its factorization.

21221021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122102118.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221021110 its reverse (1112012212), we get a palindrome (22333033322).

It can be divided in two parts, 2122102 and 1110, that added together give a palindrome (2123212).

The spelling of 21221021110 in words is "twenty-one billion, two hundred twenty-one million, twenty-one thousand, one hundred ten".