21002200101982 has 16 divisors (see below), whose sum is σ = 34370212207104. Its totient is φ = 9545628015000.

The previous prime is 21002200101943. The next prime is 21002200101983. The reversal of 21002200101982 is 28910100220012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002200101982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002200101983) 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, 41068944 + ... + 41577187.

It is an arithmetic number, because the mean of its divisors is an integer number (2148138262944).

Almost surely, 2^{21002200101982} is an apocalyptic number.

21002200101982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002200101982 is a deficient number, since it is larger than the sum of its proper divisors (13368012105122).

21002200101982 is a wasteful number, since it uses less digits than its factorization.

21002200101982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82657695.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 21002200101982 its reverse (28910100220012), we get a palindrome (49912300321994).

The spelling of 21002200101982 in words is "twenty-one trillion, two billion, two hundred million, one hundred one thousand, nine hundred eighty-two".