21849770881 has 8 divisors (see below), whose sum is σ = 22418877600. Its totient is φ = 21282387360.

The previous prime is 21849770869. The next prime is 21849770911. The reversal of 21849770881 is 18807794812.

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 21849770881 - 2⁵ = 21849770849 is a prime.

It is a super-2 number, since 2×21849770881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21849770581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405091 + ... + 455848.

It is an arithmetic number, because the mean of its divisors is an integer number (2802359700).

Almost surely, 2^21849770881 is an apocalyptic number.

It is an amenable number.

21849770881 is a deficient number, since it is larger than the sum of its proper divisors (569106719).

21849770881 is an equidigital number, since it uses as much as digits as its factorization.

21849770881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861599.

The product of its (nonzero) digits is 1806336, while the sum is 55.

The spelling of 21849770881 in words is "twenty-one billion, eight hundred forty-nine million, seven hundred seventy thousand, eight hundred eighty-one".