213121322002220 has 24 divisors (see below), whose sum is σ = 447601016385600. Its totient is φ = 85239721147392.

The previous prime is 213121322002189. The next prime is 213121322002229. The reversal of 213121322002220 is 22200223121312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (213121322002229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550279925 + ... + 550667084.

It is an arithmetic number, because the mean of its divisors is an integer number (18650042349400).

Almost surely, 2^{213121322002220} is an apocalyptic number.

213121322002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213121322002220 is an abundant number, since it is smaller than the sum of its proper divisors (234479694383380).

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

213121322002220 is a wasteful number, since it uses less digits than its factorization.

213121322002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100956697 (or 1100956695 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 213121322002220 its reverse (22200223121312), we get a palindrome (235321545123532).

The spelling of 213121322002220 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred twenty-two million, two thousand, two hundred twenty".