21333143136 has 24 divisors (see below), whose sum is σ = 55999500984. Its totient is φ = 7111047680.

The previous prime is 21333143099. The next prime is 21333143147. The reversal of 21333143136 is 63134133312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21333143136² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111110025 + ... + 111110216.

It is an arithmetic number, because the mean of its divisors is an integer number (2333312541).

Almost surely, 2^21333143136 is an apocalyptic number.

It is an amenable number.

21333143136 is an abundant number, since it is smaller than the sum of its proper divisors (34666357848).

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

21333143136 is a wasteful number, since it uses less digits than its factorization.

21333143136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222220254 (or 222220246 counting only the distinct ones).

The product of its digits is 11664, while the sum is 30.

Adding to 21333143136 its reverse (63134133312), we get a palindrome (84467276448).

The spelling of 21333143136 in words is "twenty-one billion, three hundred thirty-three million, one hundred forty-three thousand, one hundred thirty-six".