21001121101102 has 4 divisors (see below), whose sum is σ = 31501681651656. Its totient is φ = 10500560550550.

The previous prime is 21001121101099. The next prime is 21001121101109. The reversal of 21001121101102 is 20110112110012.

It is a happy number.

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

It is a super-2 number, since 2×21001121101102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001121101109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250280275274 + ... + 5250280275277.

It is an arithmetic number, because the mean of its divisors is an integer number (7875420412914).

Almost surely, 2^{21001121101102} is an apocalyptic number.

21001121101102 is a deficient number, since it is larger than the sum of its proper divisors (10500560550554).

21001121101102 is a wasteful number, since it uses less digits than its factorization.

21001121101102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500560550553.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001121101102 its reverse (20110112110012), we get a palindrome (41111233211114).

The spelling of 21001121101102 in words is "twenty-one trillion, one billion, one hundred twenty-one million, one hundred one thousand, one hundred two".