21134081830 has 16 divisors (see below), whose sum is σ = 38071159920. Its totient is φ = 8447007712.

The previous prime is 21134081807. The next prime is 21134081861. The reversal of 21134081830 is 3818043112.

It is a super-2 number, since 2×21134081830² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21134081792 and 21134081801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814720 + ... + 840259.

It is an arithmetic number, because the mean of its divisors is an integer number (2379447495).

Almost surely, 2^21134081830 is an apocalyptic number.

21134081830 is a deficient number, since it is larger than the sum of its proper divisors (16937078090).

21134081830 is a wasteful number, since it uses less digits than its factorization.

21134081830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656263.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 21134081830 in words is "twenty-one billion, one hundred thirty-four million, eighty-one thousand, eight hundred thirty".