21121122122 has 8 divisors (see below), whose sum is σ = 31746209472. Its totient is φ = 10539052300.

The previous prime is 21121122107. The next prime is 21121122137. The reversal of 21121122122 is 22122112112.

It is an interprime number because it is at equal distance from previous prime (21121122107) and next prime (21121122137).

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

It is a super-2 number, since 2×21121122122² (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 21121122122.

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, 10753154 + ... + 10755117.

It is an arithmetic number, because the mean of its divisors is an integer number (3968276184).

Almost surely, 2^21121122122 is an apocalyptic number.

21121122122 is a deficient number, since it is larger than the sum of its proper divisors (10625087350).

21121122122 is a wasteful number, since it uses less digits than its factorization.

21121122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21508764.

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

Adding to 21121122122 its reverse (22122112112), we get a palindrome (43243234234).

The spelling of 21121122122 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".