21144342330 has 32 divisors (see below), whose sum is σ = 56384913600. Its totient is φ = 5638491216.

The previous prime is 21144342269. The next prime is 21144342353. The reversal of 21144342330 is 3324344112.

21144342330 is a `hidden beast` number, since 211 + 443 + 4 + 2 + 3 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21144342294 and 21144342303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39155920 + ... + 39156459.

It is an arithmetic number, because the mean of its divisors is an integer number (1762028550).

Almost surely, 2^21144342330 is an apocalyptic number.

21144342330 is an abundant number, since it is smaller than the sum of its proper divisors (35240571270).

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

21144342330 is a wasteful number, since it uses less digits than its factorization.

21144342330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78312395 (or 78312389 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21144342330 its reverse (3324344112), we get a palindrome (24468686442).

The spelling of 21144342330 in words is "twenty-one billion, one hundred forty-four million, three hundred forty-two thousand, three hundred thirty".