21211131330 has 48 divisors (see below), whose sum is σ = 55171157184. Its totient is φ = 5654023200.

The previous prime is 21211131311. The next prime is 21211131343. The reversal of 21211131330 is 3313111212.

21211131330 is a `hidden beast` number, since 212 + 111 + 313 + 30 = 666.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183397 + ... + 275783.

It is an arithmetic number, because the mean of its divisors is an integer number (1149399108).

Almost surely, 2^21211131330 is an apocalyptic number.

21211131330 is an abundant number, since it is smaller than the sum of its proper divisors (33960025854).

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

21211131330 is a wasteful number, since it uses less digits than its factorization.

21211131330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94951 (or 94948 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21211131330 its reverse (3313111212), we get a palindrome (24524242542).

The spelling of 21211131330 in words is "twenty-one billion, two hundred eleven million, one hundred thirty-one thousand, three hundred thirty".