42629221 has 2 divisors, whose sum is σ = 42629222. Its totient is φ = 42629220.

The previous prime is 42629173. The next prime is 42629231. The reversal of 42629221 is 12292624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 11826721 = 5550^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 42629221 - 2⁹ = 42628709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42629221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42629231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21314610 + 21314611.

It is an arithmetic number, because the mean of its divisors is an integer number (21314611).

Almost surely, 2^42629221 is an apocalyptic number.

It is an amenable number.

42629221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42629221 is an equidigital number, since it uses as much as digits as its factorization.

42629221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 42629221 is about 6529.1056814850. The cubic root of 42629221 is about 349.3299315907.

The spelling of 42629221 in words is "forty-two million, six hundred twenty-nine thousand, two hundred twenty-one".