21140154200 has 96 divisors (see below), whose sum is σ = 53767272960. Its totient is φ = 7666089600.

The previous prime is 21140154193. The next prime is 21140154239. The reversal of 21140154200 is 245104112.

It is a happy number.

It is a super-2 number, since 2×21140154200² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 794309 + ... + 820491.

It is an arithmetic number, because the mean of its divisors is an integer number (560075760).

Almost surely, 2^21140154200 is an apocalyptic number.

21140154200 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 21140154200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26883636480).

21140154200 is an abundant number, since it is smaller than the sum of its proper divisors (32627118760).

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

21140154200 is a wasteful number, since it uses less digits than its factorization.

21140154200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26577 (or 26568 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21140154200 its reverse (245104112), we get a palindrome (21385258312).

The spelling of 21140154200 in words is "twenty-one billion, one hundred forty million, one hundred fifty-four thousand, two hundred".