21023361155 has 8 divisors (see below), whose sum is σ = 25368973200. Its totient is φ = 16724729056.

The previous prime is 21023361143. The next prime is 21023361193. The reversal of 21023361155 is 55116332012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21023361155 - 2⁸ = 21023360899 is a prime.

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, 11744000 + ... + 11745789.

It is an arithmetic number, because the mean of its divisors is an integer number (3171121650).

Almost surely, 2^21023361155 is an apocalyptic number.

21023361155 is a deficient number, since it is larger than the sum of its proper divisors (4345612045).

21023361155 is a wasteful number, since it uses less digits than its factorization.

21023361155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23489973.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 21023361155 its reverse (55116332012), we get a palindrome (76139693167).

The spelling of 21023361155 in words is "twenty-one billion, twenty-three million, three hundred sixty-one thousand, one hundred fifty-five".