213121220422 has 32 divisors (see below), whose sum is σ = 367161465600. Its totient is φ = 91759010400.

The previous prime is 213121220381. The next prime is 213121220423. The reversal of 213121220422 is 224022121312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 213121220393 and 213121220402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121220423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2597604 + ... + 2678392.

It is an arithmetic number, because the mean of its divisors is an integer number (11473795800).

Almost surely, 2^213121220422 is an apocalyptic number.

213121220422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

213121220422 is a deficient number, since it is larger than the sum of its proper divisors (154040245178).

213121220422 is a wasteful number, since it uses less digits than its factorization.

213121220422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87132.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 213121220422 its reverse (224022121312), we get a palindrome (437143341734).

The spelling of 213121220422 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred twenty thousand, four hundred twenty-two".