1021102001 has 4 divisors (see below), whose sum is σ = 1021188900. Its totient is φ = 1021015104.

The previous prime is 1021101959. The next prime is 1021102003. The reversal of 1021102001 is 1002011201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 875272225 + 145829776 = 29585^2 + 12076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021102001 - 2⁶ = 1021101937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021102001.

It is not an unprimeable number, because it can be changed into a prime (1021102003) 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, 22436 + ... + 50453.

It is an arithmetic number, because the mean of its divisors is an integer number (255297225).

Almost surely, 2^1021102001 is an apocalyptic number.

It is an amenable number.

1021102001 is a deficient number, since it is larger than the sum of its proper divisors (86899).

1021102001 is an equidigital number, since it uses as much as digits as its factorization.

1021102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86898.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021102001 is about 31954.6866828639. The cubic root of 1021102001 is about 1006.9850951742.

Adding to 1021102001 its reverse (1002011201), we get a palindrome (2023113202).

The spelling of 1021102001 in words is "one billion, twenty-one million, one hundred two thousand, one".