21946749213233 has 16 divisors (see below), whose sum is σ = 23660416958976. Its totient is φ = 20236724830080.

The previous prime is 21946749213163. The next prime is 21946749213247. The reversal of 21946749213233 is 33231294764912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21946749213233 - 2¹² = 21946749209137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21946749212233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79733741 + ... + 80008517.

It is an arithmetic number, because the mean of its divisors is an integer number (1478776059936).

Almost surely, 2^{21946749213233} is an apocalyptic number.

It is an amenable number.

21946749213233 is a deficient number, since it is larger than the sum of its proper divisors (1713667745743).

21946749213233 is a wasteful number, since it uses less digits than its factorization.

21946749213233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281384.

The product of its digits is 11757312, while the sum is 56.

The spelling of 21946749213233 in words is "twenty-one trillion, nine hundred forty-six billion, seven hundred forty-nine million, two hundred thirteen thousand, two hundred thirty-three".