21121221122 has 8 divisors (see below), whose sum is σ = 31682586000. Its totient is φ = 10560359124.

The previous prime is 21121221113. The next prime is 21121221137. The reversal of 21121221122 is 22112212112.

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

It is a super-2 number, since 2×21121221122² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21121221122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7529 + ... + 205667.

It is an arithmetic number, because the mean of its divisors is an integer number (3960323250).

Almost surely, 2^21121221122 is an apocalyptic number.

21121221122 is a deficient number, since it is larger than the sum of its proper divisors (10561364878).

21121221122 is a wasteful number, since it uses less digits than its factorization.

21121221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251440.

The product of its digits is 64, while the sum is 17.

Adding to 21121221122 its reverse (22112212112), we get a palindrome (43233433234).

The spelling of 21121221122 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".