421021444 has 12 divisors (see below), whose sum is σ = 739872000. Its totient is φ = 209629448.

The previous prime is 421021423. The next prime is 421021459. The reversal of 421021444 is 444120124.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219244 + ... + 221155.

It is an arithmetic number, because the mean of its divisors is an integer number (61656000).

Almost surely, 2^421021444 is an apocalyptic number.

It is an amenable number.

421021444 is a deficient number, since it is larger than the sum of its proper divisors (318850556).

421021444 is a wasteful number, since it uses less digits than its factorization.

421021444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440642 (or 440640 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 421021444 is about 20518.8070803349. The cubic root of 421021444 is about 749.4938475268.

Adding to 421021444 its reverse (444120124), we get a palindrome (865141568).

The spelling of 421021444 in words is "four hundred twenty-one million, twenty-one thousand, four hundred forty-four".