1002100023 has 6 divisors (see below), whose sum is σ = 1447477824. Its totient is φ = 668066676.

The previous prime is 1002100013. The next prime is 1002100031. The reversal of 1002100023 is 3200012001.

It is a happy number.

It is not a de Polignac number, because 1002100023 - 2⁴ = 1002100007 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: 111344447 = 1002100023 / (1 + 0 + 0 + 2 + 1 + 0 + 0 + 0 + 2 + 3).

It is a junction number, because it is equal to n+sod(n) for n = 1002099978 and 1002100014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002100013) 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, 55672215 + ... + 55672232.

It is an arithmetic number, because the mean of its divisors is an integer number (241246304).

Almost surely, 2^1002100023 is an apocalyptic number.

1002100023 is a deficient number, since it is larger than the sum of its proper divisors (445377801).

1002100023 is a wasteful number, since it uses less digits than its factorization.

1002100023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111344453 (or 111344450 counting only the distinct ones).

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

The square root of 1002100023 is about 31655.9634666203. The cubic root of 1002100023 is about 1000.6995182268.

Adding to 1002100023 its reverse (3200012001), we get a palindrome (4202112024).

It can be divided in two parts, 1002 and 100023, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 1002100023 in words is "one billion, two million, one hundred thousand, twenty-three".