21436111100 has 18 divisors (see below), whose sum is σ = 46516361304. Its totient is φ = 8574444400.

The previous prime is 21436111091. The next prime is 21436111127. The reversal of 21436111100 is 111163412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent 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, 107180456 + ... + 107180655.

Almost surely, 2^21436111100 is an apocalyptic number.

21436111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21436111100 is an abundant number, since it is smaller than the sum of its proper divisors (25080250204).

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

21436111100 is a wasteful number, since it uses less digits than its factorization.

21436111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214361125 (or 214361118 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21436111100 its reverse (111163412), we get a palindrome (21547274512).

The spelling of 21436111100 in words is "twenty-one billion, four hundred thirty-six million, one hundred eleven thousand, one hundred".