920101021 has 4 divisors (see below), whose sum is σ = 1051544032. Its totient is φ = 788658012.

The previous prime is 920101001. The next prime is 920101033. The reversal of 920101021 is 120101029.

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: 120101029 = 2131 ⋅56359.

It is a cyclic number.

It is not a de Polignac number, because 920101021 - 2⁵ = 920100989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 920100986 and 920101004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920101001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65721495 + ... + 65721508.

It is an arithmetic number, because the mean of its divisors is an integer number (262886008).

Almost surely, 2^920101021 is an apocalyptic number.

It is an amenable number.

920101021 is a deficient number, since it is larger than the sum of its proper divisors (131443011).

920101021 is a wasteful number, since it uses less digits than its factorization.

920101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131443010.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 920101021 is about 30333.1670123645. The cubic root of 920101021 is about 972.6244234289.

The spelling of 920101021 in words is "nine hundred twenty million, one hundred one thousand, twenty-one".