21010002212122 has 64 divisors (see below), whose sum is σ = 41695352121600. Its totient is φ = 7687043481600.

The previous prime is 21010002212099. The next prime is 21010002212203. The reversal of 21010002212122 is 22121220001012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010002212096 and 21010002212105.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7761279 + ... + 10112242.

It is an arithmetic number, because the mean of its divisors is an integer number (651489876900).

Almost surely, 2^{21010002212122} is an apocalyptic number.

21010002212122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010002212122 is a deficient number, since it is larger than the sum of its proper divisors (20685349909478).

21010002212122 is a wasteful number, since it uses less digits than its factorization.

21010002212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17874007.

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

Adding to 21010002212122 its reverse (22121220001012), we get a palindrome (43131222213134).

The spelling of 21010002212122 in words is "twenty-one trillion, ten billion, two million, two hundred twelve thousand, one hundred twenty-two".