21870593634 has 16 divisors (see below), whose sum is σ = 43967827872. Its totient is φ = 7252424448.

The previous prime is 21870593621. The next prime is 21870593669. The reversal of 21870593634 is 43639507812.

It is a super-2 number, since 2×21870593634² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 9442104 + ... + 9444419.

It is an arithmetic number, because the mean of its divisors is an integer number (2747989242).

It is a 1-persistent number, because it is pandigital, but 2⋅21870593634 = 43741187268 is not.

Almost surely, 2^21870593634 is an apocalyptic number.

21870593634 is an abundant number, since it is smaller than the sum of its proper divisors (22097234238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21870593634 is a wasteful number, since it uses less digits than its factorization.

21870593634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18886721.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 21870593634 in words is "twenty-one billion, eight hundred seventy million, five hundred ninety-three thousand, six hundred thirty-four".