21770847894 has 8 divisors (see below), whose sum is σ = 43541695800. Its totient is φ = 7256949296.

The previous prime is 21770847893. The next prime is 21770847911. The reversal of 21770847894 is 49874807712.

It is a sphenic number, since it is the product of 3 distinct primes.

21770847894 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770847893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814237319 + ... + 1814237330.

It is an arithmetic number, because the mean of its divisors is an integer number (5442711975).

Almost surely, 2^21770847894 is an apocalyptic number.

21770847894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21770847894 is a wasteful number, since it uses less digits than its factorization.

21770847894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628474654.

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 21770847894 in words is "twenty-one billion, seven hundred seventy million, eight hundred forty-seven thousand, eight hundred ninety-four".