21010122121202 has 8 divisors (see below), whose sum is σ = 31515218552412. Its totient is φ = 10505049270400.

The previous prime is 21010122121181. The next prime is 21010122121211. The reversal of 21010122121202 is 20212122101012.

It can be written as a sum of positive squares in 2 ways, for example, as 16602519995161 + 4407602126041 = 4074619^2 + 2099429^2 .

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

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, 3467699 + ... + 7351542.

Almost surely, 2^{21010122121202} is an apocalyptic number.

21010122121202 is a deficient number, since it is larger than the sum of its proper divisors (10505096431210).

21010122121202 is a wasteful number, since it uses less digits than its factorization.

21010122121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790204.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21010122121202 its reverse (20212122101012), we get a palindrome (41222244222214).

The spelling of 21010122121202 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred two".