21141522397 has 16 divisors (see below), whose sum is σ = 21779746560. Its totient is φ = 20512732032.

The previous prime is 21141522379. The next prime is 21141522427. The reversal of 21141522397 is 79322514112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21141522397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141522317) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4676104 + ... + 4680622.

It is an arithmetic number, because the mean of its divisors is an integer number (1361234160).

Almost surely, 2^21141522397 is an apocalyptic number.

It is an amenable number.

21141522397 is a deficient number, since it is larger than the sum of its proper divisors (638224163).

21141522397 is a wasteful number, since it uses less digits than its factorization.

21141522397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532.

The product of its digits is 30240, while the sum is 37.

The spelling of 21141522397 in words is "twenty-one billion, one hundred forty-one million, five hundred twenty-two thousand, three hundred ninety-seven".