213521340454 has 16 divisors (see below), whose sum is σ = 320782936320. Its totient is φ = 106593787080.

The previous prime is 213521340451. The next prime is 213521340503. The reversal of 213521340454 is 454043125312.

213521340454 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×213521340454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213521340451) 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 7 ways as a sum of consecutive naturals, for example, 5046969 + ... + 5089099.

It is an arithmetic number, because the mean of its divisors is an integer number (20048933520).

Almost surely, 2^213521340454 is an apocalyptic number.

213521340454 is a deficient number, since it is larger than the sum of its proper divisors (107261595866).

213521340454 is a wasteful number, since it uses less digits than its factorization.

213521340454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46035.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 213521340454 its reverse (454043125312), we get a palindrome (667564465766).

The spelling of 213521340454 in words is "two hundred thirteen billion, five hundred twenty-one million, three hundred forty thousand, four hundred fifty-four".