21352507594 has 16 divisors (see below), whose sum is σ = 35054290656. Its totient is φ = 9674067600.

The previous prime is 21352507543. The next prime is 21352507613. The reversal of 21352507594 is 49570525312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21352507594.

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, 1573977 + ... + 1587484.

It is an arithmetic number, because the mean of its divisors is an integer number (2190893166).

Almost surely, 2^21352507594 is an apocalyptic number.

21352507594 is a deficient number, since it is larger than the sum of its proper divisors (13701783062).

21352507594 is a wasteful number, since it uses less digits than its factorization.

21352507594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161781.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 21352507594 in words is "twenty-one billion, three hundred fifty-two million, five hundred seven thousand, five hundred ninety-four".