21122121220102 has 48 divisors (see below), whose sum is σ = 37272075137280. Its totient is φ = 8791690083696.

The previous prime is 21122121220073. The next prime is 21122121220103. The reversal of 21122121220102 is 20102212122112.

It is a super-2 number, since 2×21122121220102² (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 21122121220102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122121220103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3834343 + ... + 7546285.

It is an arithmetic number, because the mean of its divisors is an integer number (776501565360).

Almost surely, 2^{21122121220102} is an apocalyptic number.

21122121220102 is a deficient number, since it is larger than the sum of its proper divisors (16149953917178).

21122121220102 is an equidigital number, since it uses as much as digits as its factorization.

21122121220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712177 (or 3712094 counting only the distinct ones).

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

Adding to 21122121220102 its reverse (20102212122112), we get a palindrome (41224333342214).

The spelling of 21122121220102 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty thousand, one hundred two".