421071428 has 6 divisors (see below), whose sum is σ = 736875006. Its totient is φ = 210535712.

The previous prime is 421071403. The next prime is 421071451. The reversal of 421071428 is 824170124.

It can be written as a sum of positive squares in only one way, i.e., 381733444 + 39337984 = 19538^2 + 6272^2 .

It is a super-2 number, since 2×421071428² = 354602294955918368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421071428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52633925 + ... + 52633932.

It is an arithmetic number, because the mean of its divisors is an integer number (122812501).

Almost surely, 2^421071428 is an apocalyptic number.

It is an amenable number.

421071428 is a deficient number, since it is larger than the sum of its proper divisors (315803578).

421071428 is a wasteful number, since it uses less digits than its factorization.

421071428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105267861 (or 105267859 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 421071428 is about 20520.0250487177. The cubic root of 421071428 is about 749.5235065212.

The spelling of 421071428 in words is "four hundred twenty-one million, seventy-one thousand, four hundred twenty-eight".