421425644 has 6 divisors (see below), whose sum is σ = 737494884. Its totient is φ = 210712820.

The previous prime is 421425581. The next prime is 421425649. The reversal of 421425644 is 446524124.

It is a self number, because there is not a number n which added to its sum of digits gives 421425644.

It is not an unprimeable number, because it can be changed into a prime (421425649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52678202 + ... + 52678209.

It is an arithmetic number, because the mean of its divisors is an integer number (122915814).

Almost surely, 2^421425644 is an apocalyptic number.

It is an amenable number.

421425644 is a deficient number, since it is larger than the sum of its proper divisors (316069240).

421425644 is a wasteful number, since it uses less digits than its factorization.

421425644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105356415 (or 105356413 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 421425644 is about 20528.6542179462. The cubic root of 421425644 is about 749.7336203633.

Adding to 421425644 its reverse (446524124), we get a palindrome (867949768).

The spelling of 421425644 in words is "four hundred twenty-one million, four hundred twenty-five thousand, six hundred forty-four".