62121221 has 2 divisors, whose sum is σ = 62121222. Its totient is φ = 62121220.

The previous prime is 62121217. The next prime is 62121223. The reversal of 62121221 is 12212126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 12348196 = 7055^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 62121221 - 2² = 62121217 is a prime.

Together with 62121223, it forms a pair of twin primes.

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 62121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (62121223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31060610 + 31060611.

It is an arithmetic number, because the mean of its divisors is an integer number (31060611).

Almost surely, 2^62121221 is an apocalyptic number.

It is an amenable number.

62121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

62121221 is an equidigital number, since it uses as much as digits as its factorization.

62121221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 62121221 is about 7881.7016563684. The cubic root of 62121221 is about 396.0469390505.

Adding to 62121221 its reverse (12212126), we get a palindrome (74333347).

The spelling of 62121221 in words is "sixty-two million, one hundred twenty-one thousand, two hundred twenty-one".