21031230255 has 32 divisors (see below), whose sum is σ = 38512101888. Its totient is φ = 9600528000.

The previous prime is 21031230251. The next prime is 21031230271. The reversal of 21031230255 is 55203213012.

It is a happy number.

It is not a de Polignac number, because 21031230255 - 2² = 21031230251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031230251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69261 + ... + 216470.

It is an arithmetic number, because the mean of its divisors is an integer number (1203503184).

Almost surely, 2^21031230255 is an apocalyptic number.

21031230255 is a deficient number, since it is larger than the sum of its proper divisors (17480871633).

21031230255 is a wasteful number, since it uses less digits than its factorization.

21031230255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286447.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21031230255 its reverse (55203213012), we get a palindrome (76234443267).

The spelling of 21031230255 in words is "twenty-one billion, thirty-one million, two hundred thirty thousand, two hundred fifty-five".