21231200030 has 16 divisors (see below), whose sum is σ = 38338262064. Its totient is φ = 8465346240.

The previous prime is 21231200009. The next prime is 21231200069. The reversal of 21231200030 is 3000213212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21231199978 and 21231200014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3388436 + ... + 3394695.

It is an arithmetic number, because the mean of its divisors is an integer number (2396141379).

Almost surely, 2^21231200030 is an apocalyptic number.

21231200030 is a deficient number, since it is larger than the sum of its proper divisors (17107062034).

21231200030 is a wasteful number, since it uses less digits than its factorization.

21231200030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783451.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21231200030 its reverse (3000213212), we get a palindrome (24231413242).

The spelling of 21231200030 in words is "twenty-one billion, two hundred thirty-one million, two hundred thousand, thirty".