210212400021 has 16 divisors (see below), whose sum is σ = 312251842560. Its totient is φ = 124900735680.

The previous prime is 210212400019. The next prime is 210212400043. The reversal of 210212400021 is 120004212012.

210212400021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210212400021 - 2¹ = 210212400019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212400121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92930965 + ... + 92933226.

It is an arithmetic number, because the mean of its divisors is an integer number (19515740160).

Almost surely, 2^210212400021 is an apocalyptic number.

It is an amenable number.

210212400021 is a deficient number, since it is larger than the sum of its proper divisors (102039442539).

210212400021 is a wasteful number, since it uses less digits than its factorization.

210212400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185864236.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210212400021 its reverse (120004212012), we get a palindrome (330216612033).

The spelling of 210212400021 in words is "two hundred ten billion, two hundred twelve million, four hundred thousand, twenty-one".