213220400421 has 16 divisors (see below), whose sum is σ = 328821825024. Its totient is φ = 120372273264.

The previous prime is 213220400399. The next prime is 213220400431. The reversal of 213220400421 is 124004022312.

213220400421 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 213220400421 - 2⁶ = 213220400357 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220400431) 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, 61163031 + ... + 61166516.

It is an arithmetic number, because the mean of its divisors is an integer number (20551364064).

Almost surely, 2^213220400421 is an apocalyptic number.

213220400421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213220400421 is a deficient number, since it is larger than the sum of its proper divisors (115601424603).

213220400421 is a wasteful number, since it uses less digits than its factorization.

213220400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122329640.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 213220400421 its reverse (124004022312), we get a palindrome (337224422733).

The spelling of 213220400421 in words is "two hundred thirteen billion, two hundred twenty million, four hundred thousand, four hundred twenty-one".