21020001111100 has 72 divisors (see below), whose sum is σ = 46240154971920. Its totient is φ = 8292479546880.

The previous prime is 21020001111091. The next prime is 21020001111133. The reversal of 21020001111100 is 111110002012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246500271 + ... + 246585529.

It is an arithmetic number, because the mean of its divisors is an integer number (642224374610).

Almost surely, 2^{21020001111100} is an apocalyptic number.

21020001111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020001111100 is an abundant number, since it is smaller than the sum of its proper divisors (25220153860820).

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

21020001111100 is a wasteful number, since it uses less digits than its factorization.

21020001111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119119 (or 119112 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21020001111100 its reverse (111110002012), we get a palindrome (21131111113112).

The spelling of 21020001111100 in words is "twenty-one trillion, twenty billion, one million, one hundred eleven thousand, one hundred".