21114553531 has 4 divisors (see below), whose sum is σ = 21116629152. Its totient is φ = 21112477912.

The previous prime is 21114553489. The next prime is 21114553543. The reversal of 21114553531 is 13535541112.

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

It is a cyclic number.

It is not a de Polignac number, because 21114553531 - 2¹³ = 21114545339 is a prime.

It is a super-2 number, since 2×21114553531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21114553493 and 21114553502.

It is not an unprimeable number, because it can be changed into a prime (21114583531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022476 + ... + 1042921.

It is an arithmetic number, because the mean of its divisors is an integer number (5279157288).

Almost surely, 2^21114553531 is an apocalyptic number.

21114553531 is a deficient number, since it is larger than the sum of its proper divisors (2075621).

21114553531 is a wasteful number, since it uses less digits than its factorization.

21114553531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075620.

The product of its digits is 9000, while the sum is 31.

The spelling of 21114553531 in words is "twenty-one billion, one hundred fourteen million, five hundred fifty-three thousand, five hundred thirty-one".