21133222540 has 12 divisors (see below), whose sum is σ = 44379767376. Its totient is φ = 8453289008.

The previous prime is 21133222507. The next prime is 21133222553. The reversal of 21133222540 is 4522233112.

It is a super-2 number, since 2×21133222540² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 528330544 + ... + 528330583.

It is an arithmetic number, because the mean of its divisors is an integer number (3698313948).

Almost surely, 2^21133222540 is an apocalyptic number.

21133222540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133222540 is an abundant number, since it is smaller than the sum of its proper divisors (23246544836).

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

21133222540 is a wasteful number, since it uses less digits than its factorization.

21133222540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056661136 (or 1056661134 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21133222540 its reverse (4522233112), we get a palindrome (25655455652).

The spelling of 21133222540 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-two thousand, five hundred forty".