21762177356 has 6 divisors (see below), whose sum is σ = 38083810380. Its totient is φ = 10881088676.

The previous prime is 21762177319. The next prime is 21762177389. The reversal of 21762177356 is 65377126712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21762177356.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720272166 + ... + 2720272173.

It is an arithmetic number, because the mean of its divisors is an integer number (6347301730).

Almost surely, 2^21762177356 is an apocalyptic number.

It is an amenable number.

21762177356 is a deficient number, since it is larger than the sum of its proper divisors (16321633024).

21762177356 is a wasteful number, since it uses less digits than its factorization.

21762177356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440544343 (or 5440544341 counting only the distinct ones).

The product of its digits is 740880, while the sum is 47.

The spelling of 21762177356 in words is "twenty-one billion, seven hundred sixty-two million, one hundred seventy-seven thousand, three hundred fifty-six".