21448414931 has 4 divisors (see below), whose sum is σ = 21468480000. Its totient is φ = 21428349864.

The previous prime is 21448414903. The next prime is 21448414937. The reversal of 21448414931 is 13941484412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21448414931 is a prime.

It is a super-2 number, since 2×21448414931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21448414937) 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, 10030931 + ... + 10033068.

It is an arithmetic number, because the mean of its divisors is an integer number (5367120000).

Almost surely, 2^21448414931 is an apocalyptic number.

21448414931 is a deficient number, since it is larger than the sum of its proper divisors (20065069).

21448414931 is a wasteful number, since it uses less digits than its factorization.

21448414931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20065068.

The product of its digits is 110592, while the sum is 41.

The spelling of 21448414931 in words is "twenty-one billion, four hundred forty-eight million, four hundred fourteen thousand, nine hundred thirty-one".