21255323030 has 32 divisors (see below), whose sum is σ = 39304582560. Its totient is φ = 8270035200.

The previous prime is 21255323021. The next prime is 21255323081. The reversal of 21255323030 is 3032355212.

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, 1999730 + ... + 2010330.

It is an arithmetic number, because the mean of its divisors is an integer number (1228268205).

Almost surely, 2^21255323030 is an apocalyptic number.

21255323030 is a deficient number, since it is larger than the sum of its proper divisors (18049259530).

21255323030 is a wasteful number, since it uses less digits than its factorization.

21255323030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16064.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21255323030 its reverse (3032355212), we get a palindrome (24287678242).

The spelling of 21255323030 in words is "twenty-one billion, two hundred fifty-five million, three hundred twenty-three thousand, thirty".