21002166606102 has 32 divisors (see below), whose sum is σ = 45823633749504. Its totient is φ = 6364192245600.

The previous prime is 21002166606101. The next prime is 21002166606119. The reversal of 21002166606102 is 20160666120012.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002166606101) 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, 1741827 + ... + 6711057.

It is an arithmetic number, because the mean of its divisors is an integer number (1431988554672).

Almost surely, 2^{21002166606102} is an apocalyptic number.

21002166606102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002166606102 is an abundant number, since it is smaller than the sum of its proper divisors (24821467143402).

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

21002166606102 is a wasteful number, since it uses less digits than its factorization.

21002166606102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033284.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21002166606102 in words is "twenty-one trillion, two billion, one hundred sixty-six million, six hundred six thousand, one hundred two".