2021012001 has 24 divisors (see below), whose sum is σ = 3151212480. Its totient is φ = 1244317536.

The previous prime is 2021011981. The next prime is 2021012009. The reversal of 2021012001 is 1002101202.

It is not a de Polignac number, because 2021012001 - 2⁷ = 2021011873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2021012009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162331 + ... + 174336.

It is an arithmetic number, because the mean of its divisors is an integer number (131300520).

Almost surely, 2^2021012001 is an apocalyptic number.

It is an amenable number.

2021012001 is a deficient number, since it is larger than the sum of its proper divisors (1130200479).

2021012001 is a wasteful number, since it uses less digits than its factorization.

2021012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336725 (or 336722 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2021012001 is about 44955.6670621180. The cubic root of 2021012001 is about 1264.3179315028.

Adding to 2021012001 its reverse (1002101202), we get a palindrome (3023113203).

The spelling of 2021012001 in words is "two billion, twenty-one million, twelve thousand, one".