21240151100 has 72 divisors (see below), whose sum is σ = 52751102880. Its totient is φ = 7271896320.

The previous prime is 21240151061. The next prime is 21240151109. The reversal of 21240151100 is 115104212.

It is a super-2 number, since 2×21240151100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240151109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474902 + ... + 517698.

Almost surely, 2^21240151100 is an apocalyptic number.

21240151100 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 21240151100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26375551440).

21240151100 is an abundant number, since it is smaller than the sum of its proper divisors (31510951780).

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

21240151100 is a wasteful number, since it uses less digits than its factorization.

21240151100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43527 (or 43520 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21240151100 its reverse (115104212), we get a palindrome (21355255312).

The spelling of 21240151100 in words is "twenty-one billion, two hundred forty million, one hundred fifty-one thousand, one hundred".