21060071100 has 108 divisors (see below), whose sum is σ = 66068722720. Its totient is φ = 5611161600.

The previous prime is 21060071077. The next prime is 21060071101. The reversal of 21060071100 is 117006012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060071101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1098396 + ... + 1117404.

Almost surely, 2^21060071100 is an apocalyptic number.

21060071100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21060071100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33034361360).

21060071100 is an abundant number, since it is smaller than the sum of its proper divisors (45008651620).

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

21060071100 is a wasteful number, since it uses less digits than its factorization.

21060071100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260 (or 20250 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

Adding to 21060071100 its reverse (117006012), we get a palindrome (21177077112).

The spelling of 21060071100 in words is "twenty-one billion, sixty million, seventy-one thousand, one hundred".