21191536919356 has 12 divisors (see below), whose sum is σ = 37377198976768. Its totient is φ = 10512337211712.

The previous prime is 21191536919351. The next prime is 21191536919381. The reversal of 21191536919356 is 65391963519112.

It is a happy number.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21191536919294 and 21191536919303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191536919351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20857811421 + ... + 20857812436.

Almost surely, 2^{21191536919356} is an apocalyptic number.

It is an amenable number.

21191536919356 is a deficient number, since it is larger than the sum of its proper divisors (16185662057412).

21191536919356 is a wasteful number, since it uses less digits than its factorization.

21191536919356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41715623988 (or 41715623986 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 61.

The spelling of 21191536919356 in words is "twenty-one trillion, one hundred ninety-one billion, five hundred thirty-six million, nine hundred nineteen thousand, three hundred fifty-six".