21101221102 has 8 divisors (see below), whose sum is σ = 34086587976. Its totient is φ = 9739025112.

The previous prime is 21101221021. The next prime is 21101221103. The reversal of 21101221102 is 20112210112.

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

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101221103) 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, 405792688 + ... + 405792739.

It is an arithmetic number, because the mean of its divisors is an integer number (4260823497).

Almost surely, 2^21101221102 is an apocalyptic number.

21101221102 is a deficient number, since it is larger than the sum of its proper divisors (12985366874).

21101221102 is a wasteful number, since it uses less digits than its factorization.

21101221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811585442.

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

Adding to 21101221102 its reverse (20112210112), we get a palindrome (41213431214).

The spelling of 21101221102 in words is "twenty-one billion, one hundred one million, two hundred twenty-one thousand, one hundred two".