21431616216 has 32 divisors (see below), whose sum is σ = 53598337200. Its totient is φ = 7141299200.

The previous prime is 21431616211. The next prime is 21431616263. The reversal of 21431616216 is 61261613412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431616211) 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, 92181 + ... + 226628.

Almost surely, 2^21431616216 is an apocalyptic number.

It is an amenable number.

21431616216 is an abundant number, since it is smaller than the sum of its proper divisors (32166720984).

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

21431616216 is a wasteful number, since it uses less digits than its factorization.

21431616216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321619 (or 321615 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The spelling of 21431616216 in words is "twenty-one billion, four hundred thirty-one million, six hundred sixteen thousand, two hundred sixteen".