21648829143 has 32 divisors (see below), whose sum is σ = 31160650752. Its totient is φ = 13334816000.

The previous prime is 21648829141. The next prime is 21648829217. The reversal of 21648829143 is 34192884612.

It is a cyclic number.

It is not a de Polignac number, because 21648829143 - 2¹ = 21648829141 is a prime.

It is a super-2 number, since 2×21648829143² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21648829092 and 21648829101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648829141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247846 + ... + 323612.

It is an arithmetic number, because the mean of its divisors is an integer number (973770336).

Almost surely, 2^21648829143 is an apocalyptic number.

21648829143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21648829143 is a deficient number, since it is larger than the sum of its proper divisors (9511821609).

21648829143 is a wasteful number, since it uses less digits than its factorization.

21648829143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75935.

The product of its digits is 663552, while the sum is 48.

The spelling of 21648829143 in words is "twenty-one billion, six hundred forty-eight million, eight hundred twenty-nine thousand, one hundred forty-three".