21143604540 has 48 divisors (see below), whose sum is σ = 59292864288. Its totient is φ = 5629649664.

The previous prime is 21143604457. The next prime is 21143604541. The reversal of 21143604540 is 4540634112.

It is a super-2 number, since 2×21143604540² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21143604498 and 21143604507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143604541) 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 15 ways as a sum of consecutive naturals, for example, 230647 + ... + 309006.

It is an arithmetic number, because the mean of its divisors is an integer number (1235268006).

Almost surely, 2^21143604540 is an apocalyptic number.

21143604540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143604540 is an abundant number, since it is smaller than the sum of its proper divisors (38149259748).

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

21143604540 is a wasteful number, since it uses less digits than its factorization.

21143604540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540318 (or 540316 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21143604540 in words is "twenty-one billion, one hundred forty-three million, six hundred four thousand, five hundred forty".