21245826530 has 16 divisors (see below), whose sum is σ = 38245184640. Its totient is φ = 8497731312.

The previous prime is 21245826523. The next prime is 21245826557. The reversal of 21245826530 is 3562854212.

It is a happy 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, 91607 + ... + 225573.

It is an arithmetic number, because the mean of its divisors is an integer number (2390324040).

Almost surely, 2^21245826530 is an apocalyptic number.

21245826530 is a deficient number, since it is larger than the sum of its proper divisors (16999358110).

21245826530 is a wasteful number, since it uses less digits than its factorization.

21245826530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149833.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 21245826530 in words is "twenty-one billion, two hundred forty-five million, eight hundred twenty-six thousand, five hundred thirty".