1071421 has 8 divisors (see below), whose sum is σ = 1170680. Its totient is φ = 974592.

The previous prime is 1071419. The next prime is 1071439. The reversal of 1071421 is 1241701.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 1071225 = 14^2 + 1035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1071421 - 2¹ = 1071419 is a prime.

It is a super-2 number, since 2×1071421² = 2295885918482, which contains 22 as substring.

It is a Duffinian number.

1071421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1071395 and 1071404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (146335).

2^1071421 is an apocalyptic number.

It is an amenable number.

1071421 is a deficient number, since it is larger than the sum of its proper divisors (99259).

1071421 is a wasteful number, since it uses less digits than its factorization.

1071421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 1071421 is about 1035.0946816596. The cubic root of 1071421 is about 102.3261697733.

The spelling of 1071421 in words is "one million, seventy-one thousand, four hundred twenty-one".