21144000031 has 8 divisors (see below), whose sum is σ = 26361350784. Its totient is φ = 16475844120.

The previous prime is 21144000029. The next prime is 21144000043. The reversal of 21144000031 is 13000044112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21144000031 - 2¹ = 21144000029 is a prime.

It is a super-2 number, since 2×21144000031² (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 = 21143999969 and 21144000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144000091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137298625 + ... + 137298778.

It is an arithmetic number, because the mean of its divisors is an integer number (3295168848).

Almost surely, 2^21144000031 is an apocalyptic number.

21144000031 is a deficient number, since it is larger than the sum of its proper divisors (5217350753).

21144000031 is a wasteful number, since it uses less digits than its factorization.

21144000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274597421.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21144000031 its reverse (13000044112), we get a palindrome (34144044143).

The spelling of 21144000031 in words is "twenty-one billion, one hundred forty-four million, thirty-one", and thus it is an aban number.