1242021 has 16 divisors (see below), whose sum is σ = 1839168. Its totient is φ = 739200.

The previous prime is 1242001. The next prime is 1242029. The reversal of 1242021 is 1202421.

It is not a de Polignac number, because 1242021 - 2⁶ = 1241957 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1241988 and 1242006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (114948).

2^1242021 is an apocalyptic number.

1242021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242021 is a deficient number, since it is larger than the sum of its proper divisors (597147).

1242021 is a wasteful number, since it uses less digits than its factorization.

1242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1242021 is about 1114.4599589039. The cubic root of 1242021 is about 107.4920419564.

Adding to 1242021 its reverse (1202421), we get a palindrome (2444442).

It can be divided in two parts, 124 and 2021, that added together give a triangular number (2145 = T₆₅).

The spelling of 1242021 in words is "one million, two hundred forty-two thousand, twenty-one".