21551151230 has 32 divisors (see below), whose sum is σ = 44493886656. Its totient is φ = 7362284544.

The previous prime is 21551151229. The next prime is 21551151241. The reversal of 21551151230 is 3215115512.

It is a self number, because there is not a number n which added to its sum of digits gives 21551151230.

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, 536339 + ... + 575118.

It is an arithmetic number, because the mean of its divisors is an integer number (1390433958).

Almost surely, 2^21551151230 is an apocalyptic number.

21551151230 is an abundant number, since it is smaller than the sum of its proper divisors (22942735426).

21551151230 is a wasteful number, since it uses less digits than its factorization.

21551151230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111748.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 21551151230 its reverse (3215115512), we get a palindrome (24766266742).

The spelling of 21551151230 in words is "twenty-one billion, five hundred fifty-one million, one hundred fifty-one thousand, two hundred thirty".