21100221020102 has 16 divisors (see below), whose sum is σ = 36171895944480. Its totient is φ = 9042929745408.

The previous prime is 21100221020083. The next prime is 21100221020257. The reversal of 21100221020102 is 20102012200112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4946828 + ... + 8165264.

It is an arithmetic number, because the mean of its divisors is an integer number (2260743496530).

Almost surely, 2^{21100221020102} is an apocalyptic number.

21100221020102 is a deficient number, since it is larger than the sum of its proper divisors (15071674924378).

21100221020102 is a wasteful number, since it uses less digits than its factorization.

21100221020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686735.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100221020102 its reverse (20102012200112), we get a palindrome (41202233220214).

The spelling of 21100221020102 in words is "twenty-one trillion, one hundred billion, two hundred twenty-one million, twenty thousand, one hundred two".