21158204336 has 10 divisors (see below), whose sum is σ = 40994020932. Its totient is φ = 10579102160.

The previous prime is 21158204329. The next prime is 21158204341. The reversal of 21158204336 is 63340285112.

It is a super-2 number, since 2×21158204336² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21158204296 and 21158204305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661193870 + ... + 661193901.

Almost surely, 2^21158204336 is an apocalyptic number.

It is an amenable number.

21158204336 is a deficient number, since it is larger than the sum of its proper divisors (19835816596).

21158204336 is a wasteful number, since it uses less digits than its factorization.

21158204336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322387779 (or 1322387773 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 21158204336 its reverse (63340285112), we get a palindrome (84498489448).

The spelling of 21158204336 in words is "twenty-one billion, one hundred fifty-eight million, two hundred four thousand, three hundred thirty-six".