1216046421 has 6 divisors (see below), whose sum is σ = 1756511510. Its totient is φ = 810697608.

The previous prime is 1216046413. The next prime is 1216046459. The reversal of 1216046421 is 1246406121.

1216046421 is a `hidden beast` number, since 1 + 2 + 16 + 0 + 4 + 642 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1018503396 + 197543025 = 31914^2 + 14055^2 .

It is not a de Polignac number, because 1216046421 - 2³ = 1216046413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216046411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67558126 + ... + 67558143.

Almost surely, 2^1216046421 is an apocalyptic number.

It is an amenable number.

1216046421 is a deficient number, since it is larger than the sum of its proper divisors (540465089).

1216046421 is a wasteful number, since it uses less digits than its factorization.

1216046421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135116275 (or 135116272 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1216046421 is about 34871.8571487095. The cubic root of 1216046421 is about 1067.3742415389.

The spelling of 1216046421 in words is "one billion, two hundred sixteen million, forty-six thousand, four hundred twenty-one".