21074490734 has 16 divisors (see below), whose sum is σ = 34790716080. Its totient is φ = 9494540160.

The previous prime is 21074490721. The next prime is 21074490739. The reversal of 21074490734 is 43709447012.

It is a junction number, because it is equal to n+sod(n) for n = 21074490691 and 21074490700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074490739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4236149 + ... + 4241120.

It is an arithmetic number, because the mean of its divisors is an integer number (2174419755).

Almost surely, 2^21074490734 is an apocalyptic number.

21074490734 is a deficient number, since it is larger than the sum of its proper divisors (13716225346).

21074490734 is a wasteful number, since it uses less digits than its factorization.

21074490734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8477395.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 21074490734 in words is "twenty-one billion, seventy-four million, four hundred ninety thousand, seven hundred thirty-four".