21405060223 has 8 divisors (see below), whose sum is σ = 22561265520. Its totient is φ = 20251817280.

The previous prime is 21405060121. The next prime is 21405060227. The reversal of 21405060223 is 32206050412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21405060223 - 2¹⁷ = 21404929151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405060227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725740 + ... + 754657.

It is an arithmetic number, because the mean of its divisors is an integer number (2820158190).

Almost surely, 2^21405060223 is an apocalyptic number.

21405060223 is a deficient number, since it is larger than the sum of its proper divisors (1156205297).

21405060223 is a wasteful number, since it uses less digits than its factorization.

21405060223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481177.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21405060223 in words is "twenty-one billion, four hundred five million, sixty thousand, two hundred twenty-three".