21590145742 has 8 divisors (see below), whose sum is σ = 35329329432. Its totient is φ = 9813702600.

The previous prime is 21590145697. The next prime is 21590145803. The reversal of 21590145742 is 24754109512.

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

It is a super-2 number, since 2×21590145742² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21590145695 and 21590145704.

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, 490685109 + ... + 490685152.

It is an arithmetic number, because the mean of its divisors is an integer number (4416166179).

Almost surely, 2^21590145742 is an apocalyptic number.

21590145742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21590145742 is a deficient number, since it is larger than the sum of its proper divisors (13739183690).

21590145742 is a wasteful number, since it uses less digits than its factorization.

21590145742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981370274.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 21590145742 in words is "twenty-one billion, five hundred ninety million, one hundred forty-five thousand, seven hundred forty-two".