1012100021 has 8 divisors (see below), whose sum is σ = 1037764224. Its totient is φ = 986608000.

The previous prime is 1012100009. The next prime is 1012100039. The reversal of 1012100021 is 1200012101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1012100021 - 2¹⁴ = 1012083637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1012099981 and 1012100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012105021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31100 + ... + 54693.

It is an arithmetic number, because the mean of its divisors is an integer number (129720528).

Almost surely, 2^1012100021 is an apocalyptic number.

It is an amenable number.

1012100021 is a deficient number, since it is larger than the sum of its proper divisors (25664203).

1012100021 is an equidigital number, since it uses as much as digits as its factorization.

1012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86091.

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

The square root of 1012100021 is about 31813.5194689302. The cubic root of 1012100021 is about 1004.0171809809.

Adding to 1012100021 its reverse (1200012101), we get a palindrome (2212112122).

The spelling of 1012100021 in words is "one billion, twelve million, one hundred thousand, twenty-one".