21125444215031 has 8 divisors (see below), whose sum is σ = 22804517532384. Its totient is φ = 19454090775840.

The previous prime is 21125444215021. The next prime is 21125444215033. The reversal of 21125444215031 is 13051244452112.

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 21125444215031 - 2⁶ = 21125444214967 is a prime.

It is a super-2 number, since 2×21125444215031² (a number of 27 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 = 21125444214982 and 21125444215000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125444215033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1929963851 + ... + 1929974796.

It is an arithmetic number, because the mean of its divisors is an integer number (2850564691548).

Almost surely, 2^{21125444215031} is an apocalyptic number.

21125444215031 is a deficient number, since it is larger than the sum of its proper divisors (1679073317353).

21125444215031 is a wasteful number, since it uses less digits than its factorization.

21125444215031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859939081.

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 21125444215031 its reverse (13051244452112), we get a palindrome (34176688667143).

The spelling of 21125444215031 in words is "twenty-one trillion, one hundred twenty-five billion, four hundred forty-four million, two hundred fifteen thousand, thirty-one".