21151221122 has 32 divisors (see below), whose sum is σ = 32963825664. Its totient is φ = 10171468800.

The previous prime is 21151221121. The next prime is 21151221127. The reversal of 21151221122 is 22112215112.

It is a junction number, because it is equal to n+sod(n) for n = 21151221094 and 21151221103.

It is not an unprimeable number, because it can be changed into a prime (21151221121) 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, 2086847 + ... + 2096957.

It is an arithmetic number, because the mean of its divisors is an integer number (1030119552).

Almost surely, 2^21151221122 is an apocalyptic number.

21151221122 is a deficient number, since it is larger than the sum of its proper divisors (11812604542).

21151221122 is a wasteful number, since it uses less digits than its factorization.

21151221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514.

The product of its digits is 160, while the sum is 20.

Adding to 21151221122 its reverse (22112215112), we get a palindrome (43263436234).

The spelling of 21151221122 in words is "twenty-one billion, one hundred fifty-one million, two hundred twenty-one thousand, one hundred twenty-two".