21354841986 has 16 divisors (see below), whose sum is σ = 43294749024. Its totient is φ = 7020769824.

The previous prime is 21354841957. The next prime is 21354842011. The reversal of 21354841986 is 68914845312.

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, 24377236 + ... + 24378111.

It is an arithmetic number, because the mean of its divisors is an integer number (2705921814).

Almost surely, 2^21354841986 is an apocalyptic number.

21354841986 is an abundant number, since it is smaller than the sum of its proper divisors (21939907038).

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

21354841986 is a wasteful number, since it uses less digits than its factorization.

21354841986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48755425.

The product of its digits is 1658880, while the sum is 51.

The spelling of 21354841986 in words is "twenty-one billion, three hundred fifty-four million, eight hundred forty-one thousand, nine hundred eighty-six".