21011122202102 has 4 divisors (see below), whose sum is σ = 31516683303156. Its totient is φ = 10505561101050.

The previous prime is 21011122202071. The next prime is 21011122202123. The reversal of 21011122202102 is 20120222111012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252780550524 + ... + 5252780550527.

It is an arithmetic number, because the mean of its divisors is an integer number (7879170825789).

Almost surely, 2^{21011122202102} is an apocalyptic number.

21011122202102 is a deficient number, since it is larger than the sum of its proper divisors (10505561101054).

21011122202102 is a wasteful number, since it uses less digits than its factorization.

21011122202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505561101053.

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

Adding to 21011122202102 its reverse (20120222111012), we get a palindrome (41131344313114).

The spelling of 21011122202102 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred two thousand, one hundred two".