1012021 has 4 divisors (see below), whose sum is σ = 1015200. Its totient is φ = 1008844.

The previous prime is 1012009. The next prime is 1012031. The reversal of 1012021 is 1202101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1202101 = 71 ⋅16931.

It is a cyclic number.

It is not a de Polignac number, because 1012021 - 2⁷ = 1011893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011995 and 1012013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (253800).

2^1012021 is an apocalyptic number.

It is an amenable number.

1012021 is a deficient number, since it is larger than the sum of its proper divisors (3179).

1012021 is an equidigital number, since it uses as much as digits as its factorization.

1012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1012021 is about 1005.9925447040. The cubic root of 1012021 is about 100.3991050327.

Adding to 1012021 its reverse (1202101), we get a palindrome (2214122).

The spelling of 1012021 in words is "one million, twelve thousand, twenty-one".