21445610343 has 16 divisors (see below), whose sum is σ = 29891970816. Its totient is φ = 13650436800.

The previous prime is 21445610317. The next prime is 21445610353. The reversal of 21445610343 is 34301654412.

It is a happy number.

It is not a de Polignac number, because 21445610343 - 2¹³ = 21445602151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445610353) 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, 246358 + ... + 321843.

It is an arithmetic number, because the mean of its divisors is an integer number (1868248176).

Almost surely, 2^21445610343 is an apocalyptic number.

21445610343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21445610343 is a deficient number, since it is larger than the sum of its proper divisors (8446360473).

21445610343 is a wasteful number, since it uses less digits than its factorization.

21445610343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568774.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21445610343 in words is "twenty-one billion, four hundred forty-five million, six hundred ten thousand, three hundred forty-three".