21952531443 has 16 divisors (see below), whose sum is σ = 30996444960. Its totient is φ = 13772077056.

The previous prime is 21952531427. The next prime is 21952531463. The reversal of 21952531443 is 34413525912.

It is not a de Polignac number, because 21952531443 - 2⁴ = 21952531427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21952531463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358023 + ... + 414831.

It is an arithmetic number, because the mean of its divisors is an integer number (1937277810).

Almost surely, 2^21952531443 is an apocalyptic number.

21952531443 is a deficient number, since it is larger than the sum of its proper divisors (9043913517).

21952531443 is a wasteful number, since it uses less digits than its factorization.

21952531443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64406.

The product of its digits is 129600, while the sum is 39.

The spelling of 21952531443 in words is "twenty-one billion, nine hundred fifty-two million, five hundred thirty-one thousand, four hundred forty-three".