21831174030 has 32 divisors (see below), whose sum is σ = 52529536800. Its totient is φ = 5806677632.

The previous prime is 21831174007. The next prime is 21831174037. The reversal of 21831174030 is 3047113812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21831174037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 923685 + ... + 947024.

It is an arithmetic number, because the mean of its divisors is an integer number (1641548025).

Almost surely, 2^21831174030 is an apocalyptic number.

21831174030 is an abundant number, since it is smaller than the sum of its proper divisors (30698362770).

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

21831174030 is a wasteful number, since it uses less digits than its factorization.

21831174030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871108.

The product of its (nonzero) digits is 4032, while the sum is 30.

Adding to 21831174030 its reverse (3047113812), we get a palindrome (24878287842).

The spelling of 21831174030 in words is "twenty-one billion, eight hundred thirty-one million, one hundred seventy-four thousand, thirty".