21350003153 has 4 divisors (see below), whose sum is σ = 21538941348. Its totient is φ = 21161064960.

The previous prime is 21350003141. The next prime is 21350003173. The reversal of 21350003153 is 35130005312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 438818704 + 20911184449 = 20948^2 + 144607^2 .

It is a cyclic number.

It is not a de Polignac number, because 21350003153 - 2¹⁸ = 21349741009 is a prime.

It is a super-3 number, since 3×21350003153³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21350003173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94468928 + ... + 94469153.

It is an arithmetic number, because the mean of its divisors is an integer number (5384735337).

Almost surely, 2^21350003153 is an apocalyptic number.

It is an amenable number.

21350003153 is a deficient number, since it is larger than the sum of its proper divisors (188938195).

21350003153 is a wasteful number, since it uses less digits than its factorization.

21350003153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188938194.

The product of its (nonzero) digits is 1350, while the sum is 23.

Adding to 21350003153 its reverse (35130005312), we get a palindrome (56480008465).

The spelling of 21350003153 in words is "twenty-one billion, three hundred fifty million, three thousand, one hundred fifty-three".