21091282674 has 64 divisors (see below), whose sum is σ = 52619120640. Its totient is φ = 5475352320.

The previous prime is 21091282673. The next prime is 21091282691. The reversal of 21091282674 is 47628219012.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21091282673) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 942042 + ... + 964170.

It is an arithmetic number, because the mean of its divisors is an integer number (822173760).

Almost surely, 2^21091282674 is an apocalyptic number.

21091282674 is an abundant number, since it is smaller than the sum of its proper divisors (31527837966).

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

21091282674 is a wasteful number, since it uses less digits than its factorization.

21091282674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24215.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 21091282674 in words is "twenty-one billion, ninety-one million, two hundred eighty-two thousand, six hundred seventy-four".