21466634431 has 8 divisors (see below), whose sum is σ = 23436134784. Its totient is φ = 19500132120.

The previous prime is 21466634353. The next prime is 21466634437. The reversal of 21466634431 is 13443666412.

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

It is a cyclic number.

It is not a de Polignac number, because 21466634431 - 2⁷ = 21466634303 is a prime.

It is a super-2 number, since 2×21466634431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466634437) 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, 734521 + ... + 763186.

It is an arithmetic number, because the mean of its divisors is an integer number (2929516848).

Almost surely, 2^21466634431 is an apocalyptic number.

21466634431 is a deficient number, since it is larger than the sum of its proper divisors (1969500353).

21466634431 is a wasteful number, since it uses less digits than its factorization.

21466634431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499021.

The product of its digits is 248832, while the sum is 40.

The spelling of 21466634431 in words is "twenty-one billion, four hundred sixty-six million, six hundred thirty-four thousand, four hundred thirty-one".