21133143240 has 192 divisors, whose sum is σ = 69753216960. Its totient is φ = 5079828480.

The previous prime is 21133143209. The next prime is 21133143257. The reversal of 21133143240 is 4234133112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21133143240.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24774654 + ... + 24775506.

It is an arithmetic number, because the mean of its divisors is an integer number (363298005).

Almost surely, 2^21133143240 is an apocalyptic number.

21133143240 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 21133143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34876608480).

21133143240 is an abundant number, since it is smaller than the sum of its proper divisors (48620073720).

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

21133143240 is a wasteful number, since it uses less digits than its factorization.

21133143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21133143240 its reverse (4234133112), we get a palindrome (25367276352).

The spelling of 21133143240 in words is "twenty-one billion, one hundred thirty-three million, one hundred forty-three thousand, two hundred forty".