216971436 has 48 divisors (see below), whose sum is σ = 553875840. Its totient is φ = 65560320.

The previous prime is 216971423. The next prime is 216971437. The reversal of 216971436 is 634179612.

It is a junction number, because it is equal to n+sod(n) for n = 216971394 and 216971403.

It is not an unprimeable number, because it can be changed into a prime (216971437) 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, 47860 + ... + 52196.

It is an arithmetic number, because the mean of its divisors is an integer number (11539080).

Almost surely, 2^216971436 is an apocalyptic number.

It is an amenable number.

216971436 is an abundant number, since it is smaller than the sum of its proper divisors (336904404).

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

216971436 is a wasteful number, since it uses less digits than its factorization.

216971436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734 (or 4732 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 216971436 is about 14729.9503054152. The cubic root of 216971436 is about 600.8981327031.

The spelling of 216971436 in words is "two hundred sixteen million, nine hundred seventy-one thousand, four hundred thirty-six".