21543317630 has 16 divisors (see below), whose sum is σ = 40028874624. Its totient is φ = 8339348640.

The previous prime is 21543317629. The next prime is 21543317633. The reversal of 21543317630 is 3671334512.

It is a super-2 number, since 2×21543317630² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543317633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34746977 + ... + 34747596.

It is an arithmetic number, because the mean of its divisors is an integer number (2501804664).

Almost surely, 2^21543317630 is an apocalyptic number.

21543317630 is a deficient number, since it is larger than the sum of its proper divisors (18485556994).

21543317630 is a wasteful number, since it uses less digits than its factorization.

21543317630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69494611.

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 21543317630 in words is "twenty-one billion, five hundred forty-three million, three hundred seventeen thousand, six hundred thirty".