214651621 has 2 divisors, whose sum is σ = 214651622. Its totient is φ = 214651620.

The previous prime is 214651597. The next prime is 214651627. The reversal of 214651621 is 126156412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202749121 + 11902500 = 14239^2 + 3450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214651621 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 214651621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (214651627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107325810 + 107325811.

It is an arithmetic number, because the mean of its divisors is an integer number (107325811).

Almost surely, 2^214651621 is an apocalyptic number.

It is an amenable number.

214651621 is a deficient number, since it is larger than the sum of its proper divisors (1).

214651621 is an equidigital number, since it uses as much as digits as its factorization.

214651621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 214651621 is about 14650.9938570733. The cubic root of 214651621 is about 598.7488939620.

The spelling of 214651621 in words is "two hundred fourteen million, six hundred fifty-one thousand, six hundred twenty-one".