216421154001 has 12 divisors (see below), whose sum is σ = 336655128628. Its totient is φ = 133182248544.

The previous prime is 216421153997. The next prime is 216421154011. The reversal of 216421154001 is 100451124612.

216421154001 is a `hidden beast` number, since 2 + 1 + 642 + 1 + 15 + 4 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21100467600 + 195320686401 = 145260^2 + 441951^2 .

It is not a de Polignac number, because 216421154001 - 2² = 216421153997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216421154011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 924876610 + ... + 924876843.

Almost surely, 2^216421154001 is an apocalyptic number.

It is an amenable number.

216421154001 is a deficient number, since it is larger than the sum of its proper divisors (120233974627).

216421154001 is a wasteful number, since it uses less digits than its factorization.

216421154001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849753472 (or 1849753469 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 216421154001 its reverse (100451124612), we get a palindrome (316872278613).

The spelling of 216421154001 in words is "two hundred sixteen billion, four hundred twenty-one million, one hundred fifty-four thousand, one".