1021100001 has 16 divisors (see below), whose sum is σ = 1377528768. Its totient is φ = 672728000.

The previous prime is 1021099999. The next prime is 1021100009. The reversal of 1021100001 is 1000011201.

It is a cyclic number.

It is not a de Polignac number, because 1021100001 - 2¹ = 1021099999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021100009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174991 + ... + 180731.

It is an arithmetic number, because the mean of its divisors is an integer number (86095548).

Almost surely, 2^1021100001 is an apocalyptic number.

It is an amenable number.

1021100001 is a deficient number, since it is larger than the sum of its proper divisors (356428767).

1021100001 is a wasteful number, since it uses less digits than its factorization.

1021100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1021100001 is about 31954.6553885345. The cubic root of 1021100001 is about 1006.9844377239.

Adding to 1021100001 its reverse (1000011201), we get a palindrome (2021111202).

The spelling of 1021100001 in words is "one billion, twenty-one million, one hundred thousand, one".