213002121221 has 32 divisors (see below), whose sum is σ = 229858231680. Its totient is φ = 196784640000.

The previous prime is 213002121203. The next prime is 213002121223. The reversal of 213002121221 is 122121200312.

It is not a de Polignac number, because 213002121221 - 2¹⁴ = 213002104837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213002121223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53235221 + ... + 53239221.

It is an arithmetic number, because the mean of its divisors is an integer number (7183069740).

Almost surely, 2^213002121221 is an apocalyptic number.

It is an amenable number.

213002121221 is a deficient number, since it is larger than the sum of its proper divisors (16856110459).

213002121221 is a wasteful number, since it uses less digits than its factorization.

213002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 213002121221 its reverse (122121200312), we get a palindrome (335123321533).

The spelling of 213002121221 in words is "two hundred thirteen billion, two million, one hundred twenty-one thousand, two hundred twenty-one".