21144300031 has 4 divisors (see below), whose sum is σ = 21146009872. Its totient is φ = 21142590192.

The previous prime is 21144300029. The next prime is 21144300041. The reversal of 21144300031 is 13000344112.

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 21144300031 - 2¹ = 21144300029 is a prime.

It is a super-2 number, since 2×21144300031² (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 = 21144299981 and 21144300008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144300041) 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, 836235 + ... + 861148.

It is an arithmetic number, because the mean of its divisors is an integer number (5286502468).

Almost surely, 2^21144300031 is an apocalyptic number.

21144300031 is a deficient number, since it is larger than the sum of its proper divisors (1709841).

21144300031 is a wasteful number, since it uses less digits than its factorization.

21144300031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709840.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21144300031 its reverse (13000344112), we get a palindrome (34144644143).

The spelling of 21144300031 in words is "twenty-one billion, one hundred forty-four million, three hundred thousand, thirty-one".