21144734434 has 8 divisors (see below), whose sum is σ = 31717798848. Its totient is φ = 10572134820.

The previous prime is 21144734407. The next prime is 21144734447. The reversal of 21144734434 is 43443744112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21144734393 and 21144734402.

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, 38979 + ... + 209305.

It is an arithmetic number, because the mean of its divisors is an integer number (3964724856).

Almost surely, 2^21144734434 is an apocalyptic number.

21144734434 is a deficient number, since it is larger than the sum of its proper divisors (10573064414).

21144734434 is a wasteful number, since it uses less digits than its factorization.

21144734434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232400.

The product of its digits is 129024, while the sum is 37.

The spelling of 21144734434 in words is "twenty-one billion, one hundred forty-four million, seven hundred thirty-four thousand, four hundred thirty-four".