421223137 has 2 divisors, whose sum is σ = 421223138. Its totient is φ = 421223136.

The previous prime is 421223129. The next prime is 421223183. The reversal of 421223137 is 731322124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328370641 + 92852496 = 18121^2 + 9636^2 .

It is a cyclic number.

It is not a de Polignac number, because 421223137 - 2³ = 421223129 is a prime.

It is a super-2 number, since 2×421223137² = 354857862288241538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421223837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210611568 + 210611569.

It is an arithmetic number, because the mean of its divisors is an integer number (210611569).

Almost surely, 2^421223137 is an apocalyptic number.

It is an amenable number.

421223137 is a deficient number, since it is larger than the sum of its proper divisors (1).

421223137 is an equidigital number, since it uses as much as digits as its factorization.

421223137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 421223137 is about 20523.7213243603. The cubic root of 421223137 is about 749.6135116847.

The spelling of 421223137 in words is "four hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-seven".