21514066377578 has 4 divisors (see below), whose sum is σ = 32271099566370. Its totient is φ = 10757033188788.

The previous prime is 21514066377571. The next prime is 21514066377599. The reversal of 21514066377578 is 87577366041512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12464239603729 + 9049826773849 = 3530473^2 + 3008293^2 .

It is a super-2 number, since 2×21514066377578² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21514066377578.

It is not an unprimeable number, because it can be changed into a prime (21514066377571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378516594393 + ... + 5378516594396.

Almost surely, 2^{21514066377578} is an apocalyptic number.

21514066377578 is a deficient number, since it is larger than the sum of its proper divisors (10757033188792).

21514066377578 is a wasteful number, since it uses less digits than its factorization.

21514066377578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757033188791.

The product of its (nonzero) digits is 59270400, while the sum is 62.

The spelling of 21514066377578 in words is "twenty-one trillion, five hundred fourteen billion, sixty-six million, three hundred seventy-seven thousand, five hundred seventy-eight".