21155230410 has 16 divisors (see below), whose sum is σ = 50772553056. Its totient is φ = 5641394768.

The previous prime is 21155230409. The next prime is 21155230483. The reversal of 21155230410 is 1403255112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352587144 + ... + 352587203.

It is an arithmetic number, because the mean of its divisors is an integer number (3173284566).

Almost surely, 2^21155230410 is an apocalyptic number.

21155230410 is an abundant number, since it is smaller than the sum of its proper divisors (29617322646).

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

21155230410 is a wasteful number, since it uses less digits than its factorization.

21155230410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705174357.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21155230410 its reverse (1403255112), we get a palindrome (22558485522).

The spelling of 21155230410 in words is "twenty-one billion, one hundred fifty-five million, two hundred thirty thousand, four hundred ten".