21002002110102 has 32 divisors (see below), whose sum is σ = 45265461222240. Its totient is φ = 6457814530560.

The previous prime is 21002002110101. The next prime is 21002002110107. The reversal of 21002002110102 is 20101120020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002002110101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90299049 + ... + 90531332.

It is an arithmetic number, because the mean of its divisors is an integer number (1414545663195).

Almost surely, 2^{21002002110102} is an apocalyptic number.

21002002110102 is an abundant number, since it is smaller than the sum of its proper divisors (24263459112138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002002110102 is a wasteful number, since it uses less digits than its factorization.

21002002110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180831888.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002002110102 its reverse (20101120020012), we get a palindrome (41103122130114).

The spelling of 21002002110102 in words is "twenty-one trillion, two billion, two million, one hundred ten thousand, one hundred two".