21934671077 has 4 divisors (see below), whose sum is σ = 23928732096. Its totient is φ = 19940610060.

The previous prime is 21934671053. The next prime is 21934671091. The reversal of 21934671077 is 77017643912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21934671077 is a prime.

It is a super-2 number, since 2×21934671077² (a number of 21 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 (21934671007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997030493 + ... + 997030514.

It is an arithmetic number, because the mean of its divisors is an integer number (5982183024).

Almost surely, 2^21934671077 is an apocalyptic number.

It is an amenable number.

21934671077 is a deficient number, since it is larger than the sum of its proper divisors (1994061019).

21934671077 is a wasteful number, since it uses less digits than its factorization.

21934671077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994061018.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 21934671077 in words is "twenty-one billion, nine hundred thirty-four million, six hundred seventy-one thousand, seventy-seven".