21142535663 has 16 divisors (see below), whose sum is σ = 22186690560. Its totient is φ = 20109129216.

The previous prime is 21142535633. The next prime is 21142535683. The reversal of 21142535663 is 36653524112.

It is a cyclic number.

It is not a de Polignac number, because 21142535663 - 2¹⁶ = 21142470127 is a prime.

It is a super-2 number, since 2×21142535663² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142535633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3026831 + ... + 3033807.

It is an arithmetic number, because the mean of its divisors is an integer number (1386668160).

Almost surely, 2^21142535663 is an apocalyptic number.

21142535663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21142535663 is a deficient number, since it is larger than the sum of its proper divisors (1044154897).

21142535663 is a wasteful number, since it uses less digits than its factorization.

21142535663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726.

The product of its digits is 129600, while the sum is 38.

The spelling of 21142535663 in words is "twenty-one billion, one hundred forty-two million, five hundred thirty-five thousand, six hundred sixty-three".