21881260785 has 8 divisors (see below), whose sum is σ = 35010017280. Its totient is φ = 11670005744.

The previous prime is 21881260777. The next prime is 21881260811. The reversal of 21881260785 is 58706218812.

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

It is a cyclic number.

It is not a de Polignac number, because 21881260785 - 2³ = 21881260777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729375345 + ... + 729375374.

It is an arithmetic number, because the mean of its divisors is an integer number (4376252160).

Almost surely, 2^21881260785 is an apocalyptic number.

It is an amenable number.

21881260785 is a deficient number, since it is larger than the sum of its proper divisors (13128756495).

21881260785 is a wasteful number, since it uses less digits than its factorization.

21881260785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458750727.

The product of its (nonzero) digits is 430080, while the sum is 48.

The spelling of 21881260785 in words is "twenty-one billion, eight hundred eighty-one million, two hundred sixty thousand, seven hundred eighty-five".