216127421 has 2 divisors, whose sum is σ = 216127422. Its totient is φ = 216127420.

The previous prime is 216127411. The next prime is 216127433. The reversal of 216127421 is 124721612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193905625 + 22221796 = 13925^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 216127421 - 2¹⁰ = 216126397 is a prime.

It is a super-2 number, since 2×216127421² = 93422124216222482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216127411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108063710 + 108063711.

It is an arithmetic number, because the mean of its divisors is an integer number (108063711).

Almost surely, 2^216127421 is an apocalyptic number.

It is an amenable number.

216127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

216127421 is an equidigital number, since it uses as much as digits as its factorization.

216127421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 216127421 is about 14701.2727680293. The cubic root of 216127421 is about 600.1179592153.

The spelling of 216127421 in words is "two hundred sixteen million, one hundred twenty-seven thousand, four hundred twenty-one".