21050153355 has 128 divisors (see below), whose sum is σ = 45896564736. Its totient is φ = 7967692800.

The previous prime is 21050153347. The next prime is 21050153387. The reversal of 21050153355 is 55335105012.

It is not a de Polignac number, because 21050153355 - 2³ = 21050153347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 591394 + ... + 625976.

It is an arithmetic number, because the mean of its divisors is an integer number (358566912).

Almost surely, 2^21050153355 is an apocalyptic number.

21050153355 is an abundant number, since it is smaller than the sum of its proper divisors (24846411381).

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

21050153355 is a wasteful number, since it uses less digits than its factorization.

21050153355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34657.

The product of its (nonzero) digits is 11250, while the sum is 30.

Adding to 21050153355 its reverse (55335105012), we get a palindrome (76385258367).

The spelling of 21050153355 in words is "twenty-one billion, fifty million, one hundred fifty-three thousand, three hundred fifty-five".