21213101121 has 8 divisors (see below), whose sum is σ = 28357985280. Its totient is φ = 14105142192.

The previous prime is 21213101101. The next prime is 21213101131. The reversal of 21213101121 is 12110131212.

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

It is not a de Polignac number, because 21213101121 - 2²¹ = 21211003969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213101121.

It is not an unprimeable number, because it can be changed into a prime (21213101101) 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, 9229966 + ... + 9232263.

It is an arithmetic number, because the mean of its divisors is an integer number (3544748160).

Almost surely, 2^21213101121 is an apocalyptic number.

It is an amenable number.

21213101121 is a deficient number, since it is larger than the sum of its proper divisors (7144884159).

21213101121 is a wasteful number, since it uses less digits than its factorization.

21213101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18462615.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21213101121 its reverse (12110131212), we get a palindrome (33323232333).

The spelling of 21213101121 in words is "twenty-one billion, two hundred thirteen million, one hundred one thousand, one hundred twenty-one".