21011221022122 has 8 divisors (see below), whose sum is σ = 31526616339972. Its totient is φ = 10502348908800.

The previous prime is 21011221022111. The next prime is 21011221022149. The reversal of 21011221022122 is 22122012211012.

It can be written as a sum of positive squares in 2 ways, for example, as 20631026695321 + 380194326801 = 4542139^2 + 616599^2 .

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

It is a super-2 number, since 2×21011221022122² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011221022122.

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, 1630793079 + ... + 1630805962.

Almost surely, 2^{21011221022122} is an apocalyptic number.

21011221022122 is a deficient number, since it is larger than the sum of its proper divisors (10515395317850).

21011221022122 is a wasteful number, since it uses less digits than its factorization.

21011221022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261602264.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21011221022122 its reverse (22122012211012), we get a palindrome (43133233233134).

The spelling of 21011221022122 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-two".