21002021120122 has 256 divisors, whose sum is σ = 41657701662720. Its totient is φ = 7722650419200.

The previous prime is 21002021120107. The next prime is 21002021120123. The reversal of 21002021120122 is 22102112020012.

It is a happy number.

It is a super-2 number, since 2×21002021120122² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002021120096 and 21002021120105.

It is not an unprimeable number, because it can be changed into a prime (21002021120123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 35416561458 + ... + 35416562050.

It is an arithmetic number, because the mean of its divisors is an integer number (162725397120).

Almost surely, 2^{21002021120122} is an apocalyptic number.

21002021120122 is a deficient number, since it is larger than the sum of its proper divisors (20655680542598).

21002021120122 is a wasteful number, since it uses less digits than its factorization.

21002021120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002021120122 its reverse (22102112020012), we get a palindrome (43104133140134).

The spelling of 21002021120122 in words is "twenty-one trillion, two billion, twenty-one million, one hundred twenty thousand, one hundred twenty-two".