21047830582 has 16 divisors (see below), whose sum is σ = 32438727360. Its totient is φ = 10235161728.

The previous prime is 21047830571. The next prime is 21047830603. The reversal of 21047830582 is 28503874012.

It is a happy number.

It is a super-2 number, since 2×21047830582² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120019 + ... + 237697.

It is an arithmetic number, because the mean of its divisors is an integer number (2027420460).

Almost surely, 2^21047830582 is an apocalyptic number.

21047830582 is a deficient number, since it is larger than the sum of its proper divisors (11390896778).

21047830582 is a wasteful number, since it uses less digits than its factorization.

21047830582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120135.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 21047830582 in words is "twenty-one billion, forty-seven million, eight hundred thirty thousand, five hundred eighty-two".