221211130302 has 128 divisors (see below), whose sum is σ = 510381648000. Its totient is φ = 70969282560.

The previous prime is 221211130291. The next prime is 221211130367. The reversal of 221211130302 is 203031112122.

221211130302 is a `hidden beast` number, since 2 + 21 + 211 + 130 + 302 = 666.

It is a super-2 number, since 2×221211130302² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112118188 + ... + 112120160.

It is an arithmetic number, because the mean of its divisors is an integer number (3987356625).

Almost surely, 2^221211130302 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211130302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255190824000).

221211130302 is an abundant number, since it is smaller than the sum of its proper divisors (289170517698).

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

221211130302 is a wasteful number, since it uses less digits than its factorization.

221211130302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221211130302 its reverse (203031112122), we get a palindrome (424242242424).

The spelling of 221211130302 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thirty thousand, three hundred two".