210401421321 has 32 divisors (see below), whose sum is σ = 348441829120. Its totient is φ = 109962779904.

The previous prime is 210401421311. The next prime is 210401421341. The reversal of 210401421321 is 123124104012.

210401421321 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 210401421321 - 2⁷ = 210401421193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210401421311) 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 31 ways as a sum of consecutive naturals, for example, 3505570 + ... + 3565083.

It is an arithmetic number, because the mean of its divisors is an integer number (10888807160).

Almost surely, 2^210401421321 is an apocalyptic number.

210401421321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210401421321 is a deficient number, since it is larger than the sum of its proper divisors (138040407799).

210401421321 is a wasteful number, since it uses less digits than its factorization.

210401421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070785.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 210401421321 its reverse (123124104012), we get a palindrome (333525525333).

The spelling of 210401421321 in words is "two hundred ten billion, four hundred one million, four hundred twenty-one thousand, three hundred twenty-one".