21551150353 has 4 divisors (see below), whose sum is σ = 21561265648. Its totient is φ = 21541035060.

The previous prime is 21551150347. The next prime is 21551150363. The reversal of 21551150353 is 35305115512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21551150353 - 2¹³ = 21551142161 is a prime.

It is a super-2 number, since 2×21551150353² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21551150363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5054451 + ... + 5058712.

It is an arithmetic number, because the mean of its divisors is an integer number (5390316412).

Almost surely, 2^21551150353 is an apocalyptic number.

It is an amenable number.

21551150353 is a deficient number, since it is larger than the sum of its proper divisors (10115295).

21551150353 is a wasteful number, since it uses less digits than its factorization.

21551150353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115294.

The product of its (nonzero) digits is 11250, while the sum is 31.

Adding to 21551150353 its reverse (35305115512), we get a palindrome (56856265865).

The spelling of 21551150353 in words is "twenty-one billion, five hundred fifty-one million, one hundred fifty thousand, three hundred fifty-three".