21783813950 has 12 divisors (see below), whose sum is σ = 40517894040. Its totient is φ = 8713525560.

The previous prime is 21783813943. The next prime is 21783813967. The reversal of 21783813950 is 5931838712.

It is a junction number, because it is equal to n+sod(n) for n = 21783813895 and 21783813904.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 217838090 + ... + 217838189.

It is an arithmetic number, because the mean of its divisors is an integer number (3376491170).

Almost surely, 2^21783813950 is an apocalyptic number.

21783813950 is a deficient number, since it is larger than the sum of its proper divisors (18734080090).

21783813950 is a wasteful number, since it uses less digits than its factorization.

21783813950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435676291 (or 435676286 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 21783813950 in words is "twenty-one billion, seven hundred eighty-three million, eight hundred thirteen thousand, nine hundred fifty".