21002211221202 has 24 divisors (see below), whose sum is σ = 47899779978960. Its totient is φ = 6632277227640.

The previous prime is 21002211221179. The next prime is 21002211221209. The reversal of 21002211221202 is 20212211220012.

It is a happy number.

21002211221202 is a `hidden beast` number, since 21 + 0 + 0 + 221 + 1 + 221 + 202 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21002211221209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30704986824 + ... + 30704987507.

It is an arithmetic number, because the mean of its divisors is an integer number (1995824165790).

Almost surely, 2^{21002211221202} is an apocalyptic number.

21002211221202 is an abundant number, since it is smaller than the sum of its proper divisors (26897568757758).

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

21002211221202 is a wasteful number, since it uses less digits than its factorization.

21002211221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61409974358 (or 61409974355 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21002211221202 its reverse (20212211220012), we get a palindrome (41214422441214).

The spelling of 21002211221202 in words is "twenty-one trillion, two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred two".