21377522337077 has 16 divisors (see below), whose sum is σ = 22580445760320. Its totient is φ = 20182384051200.

The previous prime is 21377522337029. The next prime is 21377522337089. The reversal of 21377522337077 is 77073322577312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21377522337077 - 2¹⁸ = 21377522074933 is a prime.

It is a super-2 number, since 2×21377522337077² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377522337377) 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, 151413077 + ... + 151554197.

It is an arithmetic number, because the mean of its divisors is an integer number (1411277860020).

Almost surely, 2^{21377522337077} is an apocalyptic number.

It is an amenable number.

21377522337077 is a deficient number, since it is larger than the sum of its proper divisors (1202923423243).

21377522337077 is a wasteful number, since it uses less digits than its factorization.

21377522337077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168644.

The product of its (nonzero) digits is 18151560, while the sum is 56.

The spelling of 21377522337077 in words is "twenty-one trillion, three hundred seventy-seven billion, five hundred twenty-two million, three hundred thirty-seven thousand, seventy-seven".