221210211222121 has 8 divisors (see below), whose sum is σ = 251812414355904. Its totient is φ = 192356705410320.

The previous prime is 221210211222101. The next prime is 221210211222131. The reversal of 221210211222121 is 121222112012122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221210211222121 - 2²⁹ = 221209674351209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210211222092 and 221210211222101.

It is not an unprimeable number, because it can be changed into a prime (221210211222101) 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, 437174330226 + ... + 437174330731.

It is an arithmetic number, because the mean of its divisors is an integer number (31476551794488).

Almost surely, 2^{221210211222121} is an apocalyptic number.

It is an amenable number.

221210211222121 is a deficient number, since it is larger than the sum of its proper divisors (30602203133783).

221210211222121 is a wasteful number, since it uses less digits than its factorization.

221210211222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874348660991.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221210211222121 its reverse (121222112012122), we get a palindrome (342432323234243).

The spelling of 221210211222121 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".