21001444131 has 8 divisors (see below), whose sum is σ = 28003101264. Its totient is φ = 14000374880.

The previous prime is 21001444103. The next prime is 21001444133. The reversal of 21001444131 is 13144410012.

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 21001444131 - 2⁵ = 21001444099 is a prime.

It is a super-2 number, since 2×21001444131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001444098 and 21001444107.

It is not an unprimeable number, because it can be changed into a prime (21001444133) 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 7 ways as a sum of consecutive naturals, for example, 55476 + ... + 212321.

It is an arithmetic number, because the mean of its divisors is an integer number (3500387658).

Almost surely, 2^21001444131 is an apocalyptic number.

21001444131 is a deficient number, since it is larger than the sum of its proper divisors (7001657133).

21001444131 is a wasteful number, since it uses less digits than its factorization.

21001444131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293941.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21001444131 its reverse (13144410012), we get a palindrome (34145854143).

The spelling of 21001444131 in words is "twenty-one billion, one million, four hundred forty-four thousand, one hundred thirty-one".