21485653077 has 8 divisors (see below), whose sum is σ = 32740042816. Its totient is φ = 12277516032.

The previous prime is 21485653069. The next prime is 21485653087. The reversal of 21485653077 is 77035658412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21485653077 - 2³ = 21485653069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485653027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511563148 + ... + 511563189.

It is an arithmetic number, because the mean of its divisors is an integer number (4092505352).

Almost surely, 2^21485653077 is an apocalyptic number.

It is an amenable number.

21485653077 is a deficient number, since it is larger than the sum of its proper divisors (11254389739).

21485653077 is a wasteful number, since it uses less digits than its factorization.

21485653077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023126347.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 21485653077 in words is "twenty-one billion, four hundred eighty-five million, six hundred fifty-three thousand, seventy-seven".