421231477 has 2 divisors, whose sum is σ = 421231478. Its totient is φ = 421231476.

The previous prime is 421231429. The next prime is 421231529. The reversal of 421231477 is 774132124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247149841 + 174081636 = 15721^2 + 13194^2 .

It is a cyclic number.

It is not a de Polignac number, because 421231477 - 2¹⁵ = 421198709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421231277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210615738 + 210615739.

It is an arithmetic number, because the mean of its divisors is an integer number (210615739).

Almost surely, 2^421231477 is an apocalyptic number.

It is an amenable number.

421231477 is a deficient number, since it is larger than the sum of its proper divisors (1).

421231477 is an equidigital number, since it uses as much as digits as its factorization.

421231477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 421231477 is about 20523.9245028820. The cubic root of 421231477 is about 749.6184589719.

The spelling of 421231477 in words is "four hundred twenty-one million, two hundred thirty-one thousand, four hundred seventy-seven".