21002142122102 has 16 divisors (see below), whose sum is σ = 31561103991312. Its totient is φ = 10481775717600.

The previous prime is 21002142122053. The next prime is 21002142122107. The reversal of 21002142122102 is 20122124120012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002142122107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26843852 + ... + 27615152.

It is an arithmetic number, because the mean of its divisors is an integer number (1972568999457).

Almost surely, 2^{21002142122102} is an apocalyptic number.

21002142122102 is a deficient number, since it is larger than the sum of its proper divisors (10558961869210).

21002142122102 is a wasteful number, since it uses less digits than its factorization.

21002142122102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796303.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21002142122102 its reverse (20122124120012), we get a palindrome (41124266242114).

The spelling of 21002142122102 in words is "twenty-one trillion, two billion, one hundred forty-two million, one hundred twenty-two thousand, one hundred two".