2010400021 has 16 divisors (see below), whose sum is σ = 2333689344. Its totient is φ = 1696284144.

The previous prime is 2010400001. The next prime is 2010400039. The reversal of 2010400021 is 1200040102.

It is a cyclic number.

It is not a de Polignac number, because 2010400021 - 2¹³ = 2010391829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2010399980 and 2010400007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2010400001) 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, 158310 + ... + 170536.

It is an arithmetic number, because the mean of its divisors is an integer number (145855584).

Almost surely, 2^2010400021 is an apocalyptic number.

It is an amenable number.

2010400021 is a deficient number, since it is larger than the sum of its proper divisors (323289323).

2010400021 is a wasteful number, since it uses less digits than its factorization.

2010400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12600.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2010400021 is about 44837.4845525482. The cubic root of 2010400021 is about 1262.1011429775.

Adding to 2010400021 its reverse (1200040102), we get a palindrome (3210440123).

The spelling of 2010400021 in words is "two billion, ten million, four hundred thousand, twenty-one".