21210111201100 has 18 divisors (see below), whose sum is σ = 46025941306604. Its totient is φ = 8484044480400.

The previous prime is 21210111201017. The next prime is 21210111201131. The reversal of 21210111201100 is 110211101212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106050555906 + ... + 106050556105.

Almost surely, 2^{21210111201100} is an apocalyptic number.

21210111201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210111201100 is an abundant number, since it is smaller than the sum of its proper divisors (24815830105504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210111201100 is a wasteful number, since it uses less digits than its factorization.

21210111201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212101112025 (or 212101112018 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210111201100 its reverse (110211101212), we get a palindrome (21320322302312).

The spelling of 21210111201100 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, two hundred one thousand, one hundred".