21433327266 has 64 divisors (see below), whose sum is σ = 46646409600. Its totient is φ = 6526302720.

The previous prime is 21433327231. The next prime is 21433327277. The reversal of 21433327266 is 66272333412.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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, 3262501 + ... + 3269063.

It is an arithmetic number, because the mean of its divisors is an integer number (728850150).

Almost surely, 2^21433327266 is an apocalyptic number.

21433327266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21433327266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23323204800).

21433327266 is an abundant number, since it is smaller than the sum of its proper divisors (25213082334).

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

21433327266 is a wasteful number, since it uses less digits than its factorization.

21433327266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011.

The product of its digits is 217728, while the sum is 39.

The spelling of 21433327266 in words is "twenty-one billion, four hundred thirty-three million, three hundred twenty-seven thousand, two hundred sixty-six".