1010021 has 16 divisors (see below), whose sum is σ = 1166400. Its totient is φ = 868608.

The previous prime is 1010003. The next prime is 1010033. The reversal of 1010021 is 1200101.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1009987 and 1010014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010081) 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, 17090 + ... + 17148.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2^1010021 is an apocalyptic number.

It is an amenable number.

1010021 is a deficient number, since it is larger than the sum of its proper divisors (156379).

1010021 is a wasteful number, since it uses less digits than its factorization.

1010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1010021 is about 1004.9980099483. The cubic root of 1010021 is about 100.3329237213.

Adding to 1010021 its reverse (1200101), we get a palindrome (2210122).

Multiplying 1010021 by its reverse (1200101), we get a palindrome (1212127212121).

The spelling of 1010021 in words is "one million, ten thousand, twenty-one".