21349481236 has 6 divisors (see below), whose sum is σ = 37361592170. Its totient is φ = 10674740616.

The previous prime is 21349481227. The next prime is 21349481267. The reversal of 21349481236 is 63218494312.

It can be written as a sum of positive squares in only one way, i.e., 14974416900 + 6375064336 = 122370^2 + 79844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21349481192 and 21349481201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668685151 + ... + 2668685158.

Almost surely, 2^21349481236 is an apocalyptic number.

It is an amenable number.

21349481236 is a deficient number, since it is larger than the sum of its proper divisors (16012110934).

21349481236 is a wasteful number, since it uses less digits than its factorization.

21349481236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337370313 (or 5337370311 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The spelling of 21349481236 in words is "twenty-one billion, three hundred forty-nine million, four hundred eighty-one thousand, two hundred thirty-six".