21055433374 has 8 divisors (see below), whose sum is σ = 31651365600. Its totient is φ = 10504978176.

The previous prime is 21055433353. The next prime is 21055433381. The reversal of 21055433374 is 47333455012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11368099 + ... + 11369950.

It is an arithmetic number, because the mean of its divisors is an integer number (3956420700).

Almost surely, 2^21055433374 is an apocalyptic number.

21055433374 is a deficient number, since it is larger than the sum of its proper divisors (10595932226).

21055433374 is a wasteful number, since it uses less digits than its factorization.

21055433374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22738514.

The product of its (nonzero) digits is 151200, while the sum is 37.

Adding to 21055433374 its reverse (47333455012), we get a palindrome (68388888386).

The spelling of 21055433374 in words is "twenty-one billion, fifty-five million, four hundred thirty-three thousand, three hundred seventy-four".