421224137 has 2 divisors, whose sum is σ = 421224138. Its totient is φ = 421224136.

The previous prime is 421224131. The next prime is 421224143. The reversal of 421224137 is 731422124.

It is a balanced prime because it is at equal distance from previous prime (421224131) and next prime (421224143).

It can be written as a sum of positive squares in only one way, i.e., 374383801 + 46840336 = 19349^2 + 6844^2 .

It is a cyclic number.

It is not a de Polignac number, because 421224137 - 2⁴ = 421224121 is a prime.

It is not a weakly prime, because it can be changed into another prime (421224131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210612068 + 210612069.

It is an arithmetic number, because the mean of its divisors is an integer number (210612069).

Almost surely, 2^421224137 is an apocalyptic number.

It is an amenable number.

421224137 is a deficient number, since it is larger than the sum of its proper divisors (1).

421224137 is an equidigital number, since it uses as much as digits as its factorization.

421224137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 421224137 is about 20523.7456863994. The cubic root of 421224137 is about 749.6141048881.

The spelling of 421224137 in words is "four hundred twenty-one million, two hundred twenty-four thousand, one hundred thirty-seven".