21023000001 has 6 divisors (see below), whose sum is σ = 30366555570. Its totient is φ = 14015333328.

The previous prime is 21022999997. The next prime is 21023000041. The reversal of 21023000001 is 10000032012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18208803600 + 2814196401 = 134940^2 + 53049^2 .

It is not a de Polignac number, because 21023000001 - 2² = 21022999997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2335888889 = 21023000001 / (2 + 1 + 0 + 2 + 3 + 0 + 0 + 0 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (21023000041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167944436 + ... + 1167944453.

It is an arithmetic number, because the mean of its divisors is an integer number (5061092595).

Almost surely, 2^21023000001 is an apocalyptic number.

It is an amenable number.

21023000001 is a deficient number, since it is larger than the sum of its proper divisors (9343555569).

21023000001 is a wasteful number, since it uses less digits than its factorization.

21023000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335888895 (or 2335888892 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21023000001 its reverse (10000032012), we get a palindrome (31023032013).

The spelling of 21023000001 in words is "twenty-one billion, twenty-three million, one", and thus it is an aban number and an uban number.