1020921 has 8 divisors (see below), whose sum is σ = 1485024. Its totient is φ = 618720.

The previous prime is 1020913. The next prime is 1020931. The reversal of 1020921 is 1290201.

It is a happy number.

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

It is not a de Polignac number, because 1020921 - 2³ = 1020913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020921.

It is not an unprimeable number, because it can be changed into a prime (1020931) 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, 15436 + ... + 15501.

It is an arithmetic number, because the mean of its divisors is an integer number (185628).

2^1020921 is an apocalyptic number.

1020921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1020921 is a deficient number, since it is larger than the sum of its proper divisors (464103).

1020921 is a wasteful number, since it uses less digits than its factorization.

1020921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30951.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1020921 is about 1010.4063538993. The cubic root of 1020921 is about 100.6925592115.

The spelling of 1020921 in words is "one million, twenty thousand, nine hundred twenty-one".