211421023401 has 16 divisors (see below), whose sum is σ = 322421299200. Its totient is φ = 120716039568.

The previous prime is 211421023343. The next prime is 211421023459. The reversal of 211421023401 is 104320124112.

211421023401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211421023343) and next prime (211421023459).

It is not a de Polignac number, because 211421023401 - 2¹⁸ = 211420761257 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (211421023001) 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, 3971841 + ... + 4024718.

It is an arithmetic number, because the mean of its divisors is an integer number (20151331200).

Almost surely, 2^211421023401 is an apocalyptic number.

211421023401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211421023401 is a deficient number, since it is larger than the sum of its proper divisors (111000275799).

211421023401 is a wasteful number, since it uses less digits than its factorization.

211421023401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997828.

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

Adding to 211421023401 its reverse (104320124112), we get a palindrome (315741147513).

The spelling of 211421023401 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, four hundred one".