21231012030 has 32 divisors (see below), whose sum is σ = 51098801184. Its totient is φ = 5645561856.

The previous prime is 21231011957. The next prime is 21231012041. The reversal of 21231012030 is 3021013212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 991819 + ... + 1012998.

It is an arithmetic number, because the mean of its divisors is an integer number (1596837537).

Almost surely, 2^21231012030 is an apocalyptic number.

21231012030 is an abundant number, since it is smaller than the sum of its proper divisors (29867789154).

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

21231012030 is a wasteful number, since it uses less digits than its factorization.

21231012030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005180.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231012030 its reverse (3021013212), we get a palindrome (24252025242).

The spelling of 21231012030 in words is "twenty-one billion, two hundred thirty-one million, twelve thousand, thirty".