213121230984 has 48 divisors (see below), whose sum is σ = 577325548800. Its totient is φ = 71025368544.

The previous prime is 213121230947. The next prime is 213121231003. The reversal of 213121230984 is 489032121312.

213121230984 is a `hidden beast` number, since 2 + 131 + 212 + 309 + 8 + 4 = 666.

It is a super-2 number, since 2×213121230984² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31657 + ... + 653639.

It is an arithmetic number, because the mean of its divisors is an integer number (12027615600).

Almost surely, 2^213121230984 is an apocalyptic number.

213121230984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213121230984 is an abundant number, since it is smaller than the sum of its proper divisors (364204317816).

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

213121230984 is a wasteful number, since it uses less digits than its factorization.

213121230984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626754 (or 626747 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 213121230984 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred thirty thousand, nine hundred eighty-four".