213540221334 has 16 divisors (see below), whose sum is σ = 465905937600. Its totient is φ = 64709157960.

The previous prime is 213540221269. The next prime is 213540221359. The reversal of 213540221334 is 433122045312.

It is a super-2 number, since 2×213540221334² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1617728884 + ... + 1617729015.

It is an arithmetic number, because the mean of its divisors is an integer number (29119121100).

Almost surely, 2^213540221334 is an apocalyptic number.

213540221334 is an abundant number, since it is smaller than the sum of its proper divisors (252365716266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213540221334 is a wasteful number, since it uses less digits than its factorization.

213540221334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235457915.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 213540221334 its reverse (433122045312), we get a palindrome (646662266646).

The spelling of 213540221334 in words is "two hundred thirteen billion, five hundred forty million, two hundred twenty-one thousand, three hundred thirty-four".