1010920021 has 2 divisors, whose sum is σ = 1010920022. Its totient is φ = 1010920020.

The previous prime is 1010919979. The next prime is 1010920033. The reversal of 1010920021 is 1200290101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836019396 + 174900625 = 28914^2 + 13225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010920021 - 2²¹ = 1008822869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1010919977 and 1010920004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010920051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505460010 + 505460011.

It is an arithmetic number, because the mean of its divisors is an integer number (505460011).

Almost surely, 2^1010920021 is an apocalyptic number.

It is an amenable number.

1010920021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010920021 is an equidigital number, since it uses as much as digits as its factorization.

1010920021 is an evil number, because the sum of its binary digits is even.

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

The square root of 1010920021 is about 31794.9684855953. The cubic root of 1010920021 is about 1003.6268371499.

The spelling of 1010920021 in words is "one billion, ten million, nine hundred twenty thousand, twenty-one".