216420045 has 16 divisors (see below), whose sum is σ = 349451520. Its totient is φ = 114364224.

The previous prime is 216420023. The next prime is 216420053. The reversal of 216420045 is 540024612.

It is not a de Polignac number, because 216420045 - 2¹² = 216415949 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216419997 and 216420024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64549 + ... + 67818.

It is an arithmetic number, because the mean of its divisors is an integer number (21840720).

Almost surely, 2^216420045 is an apocalyptic number.

It is an amenable number.

216420045 is a deficient number, since it is larger than the sum of its proper divisors (133031475).

216420045 is a wasteful number, since it uses less digits than its factorization.

216420045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132484.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 216420045 is about 14711.2217371638. The cubic root of 216420045 is about 600.3886787159.

Adding to 216420045 its reverse (540024612), we get a palindrome (756444657).

The spelling of 216420045 in words is "two hundred sixteen million, four hundred twenty thousand, forty-five".