21479081569 has 16 divisors (see below), whose sum is σ = 24548622336. Its totient is φ = 18614494800.

The previous prime is 21479081549. The next prime is 21479081621. The reversal of 21479081569 is 96518097412.

It is not a de Polignac number, because 21479081569 - 2¹¹ = 21479079521 is a prime.

It is a super-2 number, since 2×21479081569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21479081509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447217 + ... + 492910.

It is an arithmetic number, because the mean of its divisors is an integer number (1534288896).

Almost surely, 2^21479081569 is an apocalyptic number.

It is an amenable number.

21479081569 is a deficient number, since it is larger than the sum of its proper divisors (3069540767).

21479081569 is a wasteful number, since it uses less digits than its factorization.

21479081569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940236.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 21479081569 in words is "twenty-one billion, four hundred seventy-nine million, eighty-one thousand, five hundred sixty-nine".