21466306377 has 12 divisors (see below), whose sum is σ = 31034860740. Its totient is φ = 14297959968.

The previous prime is 21466306373. The next prime is 21466306403. The reversal of 21466306377 is 77360366412.

21466306377 is a `hidden beast` number, since 2 + 1 + 4 + 6 + 6 + 3 + 0 + 637 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6460301376 + 15006005001 = 80376^2 + 122499^2 .

It is not a de Polignac number, because 21466306377 - 2² = 21466306373 is a prime.

It is a super-2 number, since 2×21466306377² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21466306373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1065378 + ... + 1085339.

It is an arithmetic number, because the mean of its divisors is an integer number (2586238395).

Almost surely, 2^21466306377 is an apocalyptic number.

It is an amenable number.

21466306377 is a deficient number, since it is larger than the sum of its proper divisors (9568554363).

21466306377 is a wasteful number, since it uses less digits than its factorization.

21466306377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151832 (or 2151829 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The spelling of 21466306377 in words is "twenty-one billion, four hundred sixty-six million, three hundred six thousand, three hundred seventy-seven".