221021210212002 has 48 divisors (see below), whose sum is σ = 501101632207800. Its totient is φ = 70330053620736.

The previous prime is 221021210211941. The next prime is 221021210212009. The reversal of 221021210212002 is 200212012120122.

It is a happy number.

221021210212002 is a `hidden beast` number, since 2 + 210 + 21 + 210 + 21 + 200 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 209861608533201 + 11159601678801 = 14486601^2 + 3340599^2 .

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 (221021210212009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3130754127 + ... + 3130824722.

Almost surely, 2^{221021210212002} is an apocalyptic number.

221021210212002 is an abundant number, since it is smaller than the sum of its proper divisors (280080421995798).

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

221021210212002 is a wasteful number, since it uses less digits than its factorization.

221021210212002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261578947 (or 6261578944 counting only the distinct ones).

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

Adding to 221021210212002 its reverse (200212012120122), we get a palindrome (421233222332124).

The spelling of 221021210212002 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred ten million, two hundred twelve thousand, two".