21887461579 has 2 divisors, whose sum is σ = 21887461580. Its totient is φ = 21887461578.

The previous prime is 21887461571. The next prime is 21887461621. The reversal of 21887461579 is 97516478812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21887461579 - 2³ = 21887461571 is a prime.

It is a super-3 number, since 3×21887461579³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21887461571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943730789 + 10943730790.

It is an arithmetic number, because the mean of its divisors is an integer number (10943730790).

Almost surely, 2^21887461579 is an apocalyptic number.

21887461579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21887461579 is an equidigital number, since it uses as much as digits as its factorization.

21887461579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The spelling of 21887461579 in words is "twenty-one billion, eight hundred eighty-seven million, four hundred sixty-one thousand, five hundred seventy-nine".