21212002002 has 16 divisors (see below), whose sum is σ = 44656846560. Its totient is φ = 6698526912.

The previous prime is 21212001901. The next prime is 21212002003. The reversal of 21212002002 is 20020021212.

It is not an unprimeable number, because it can be changed into a prime (21212002003) 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, 93034983 + ... + 93035210.

It is an arithmetic number, because the mean of its divisors is an integer number (2791052910).

Almost surely, 2^21212002002 is an apocalyptic number.

21212002002 is an abundant number, since it is smaller than the sum of its proper divisors (23444844558).

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

21212002002 is a wasteful number, since it uses less digits than its factorization.

21212002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186070217.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21212002002 its reverse (20020021212), we get a palindrome (41232023214).

The spelling of 21212002002 in words is "twenty-one billion, two hundred twelve million, two thousand, two".