21613454434 has 16 divisors (see below), whose sum is σ = 38088046080. Its totient is φ = 9068582160.

The previous prime is 21613454419. The next prime is 21613454437. The reversal of 21613454434 is 43445431612.

It is a junction number, because it is equal to n+sod(n) for n = 21613454393 and 21613454402.

It is not an unprimeable number, because it can be changed into a prime (21613454437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37785474 + ... + 37786045.

It is an arithmetic number, because the mean of its divisors is an integer number (2380502880).

Almost surely, 2^21613454434 is an apocalyptic number.

21613454434 is a deficient number, since it is larger than the sum of its proper divisors (16474591646).

21613454434 is a wasteful number, since it uses less digits than its factorization.

21613454434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75571545.

The product of its digits is 138240, while the sum is 37.

The spelling of 21613454434 in words is "twenty-one billion, six hundred thirteen million, four hundred fifty-four thousand, four hundred thirty-four".