1021002011 has 4 divisors (see below), whose sum is σ = 1021383000. Its totient is φ = 1020621024.

The previous prime is 1021002001. The next prime is 1021002029. The reversal of 1021002011 is 1102001201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1102001201 = 7 ⋅157428743.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021002011 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 1021002011.

It is not an unprimeable number, because it can be changed into a prime (1021002001) 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, 186446 + ... + 191843.

It is an arithmetic number, because the mean of its divisors is an integer number (255345750).

Almost surely, 2^1021002011 is an apocalyptic number.

1021002011 is a deficient number, since it is larger than the sum of its proper divisors (380989).

1021002011 is an equidigital number, since it uses as much as digits as its factorization.

1021002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380988.

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

The square root of 1021002011 is about 31953.1220853299. The cubic root of 1021002011 is about 1006.9522248941.

Adding to 1021002011 its reverse (1102001201), we get a palindrome (2123003212).

The spelling of 1021002011 in words is "one billion, twenty-one million, two thousand, eleven".