21327670077 has 12 divisors (see below), whose sum is σ = 33079651776. Its totient is φ = 12187239960.

The previous prime is 21327670009. The next prime is 21327670079. The reversal of 21327670077 is 77007672312.

It is not a de Polignac number, because 21327670077 - 2²² = 21323475773 is a prime.

It is a super-2 number, since 2×21327670077² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327670079) 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, 72542949 + ... + 72543242.

It is an arithmetic number, because the mean of its divisors is an integer number (2756637648).

Almost surely, 2^21327670077 is an apocalyptic number.

It is an amenable number.

21327670077 is a deficient number, since it is larger than the sum of its proper divisors (11751981699).

21327670077 is a wasteful number, since it uses less digits than its factorization.

21327670077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145086208 (or 145086201 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 42.

The spelling of 21327670077 in words is "twenty-one billion, three hundred twenty-seven million, six hundred seventy thousand, seventy-seven".