216741000421 has 16 divisors (see below), whose sum is σ = 250368071040. Its totient is φ = 185435860480.

The previous prime is 216741000419. The next prime is 216741000431. The reversal of 216741000421 is 124000147612.

216741000421 is a nontrivial binomial coefficient, being equal to C(658394, 2).

It is a cyclic number.

It is not a de Polignac number, because 216741000421 - 2¹ = 216741000419 is a prime.

It is a super-2 number, since 2×216741000421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216741000421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216741000431) 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, 5576985 + ... + 5615713.

It is an arithmetic number, because the mean of its divisors is an integer number (15648004440).

Almost surely, 2^216741000421 is an apocalyptic number.

216741000421 is the 658393-rd triangular number and also the 329197-th hexagonal number.

216741000421 is the 219465-th centered nonagonal number.

It is an amenable number.

216741000421 is a deficient number, since it is larger than the sum of its proper divisors (33627070619).

216741000421 is a wasteful number, since it uses less digits than its factorization.

216741000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68684.

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 216741000421 in words is "two hundred sixteen billion, seven hundred forty-one million, four hundred twenty-one", and thus it is an aban number.