21077271055 has 16 divisors (see below), whose sum is σ = 25506381600. Its totient is φ = 16719770752.

The previous prime is 21077271049. The next prime is 21077271067. The reversal of 21077271055 is 55017277012.

It is a cyclic number.

It is not a de Polignac number, because 21077271055 - 2¹¹ = 21077269007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413217 + ... + 461413.

It is an arithmetic number, because the mean of its divisors is an integer number (1594148850).

Almost surely, 2^21077271055 is an apocalyptic number.

21077271055 is a deficient number, since it is larger than the sum of its proper divisors (4429110545).

21077271055 is a wasteful number, since it uses less digits than its factorization.

21077271055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48938.

The product of its (nonzero) digits is 34300, while the sum is 37.

The spelling of 21077271055 in words is "twenty-one billion, seventy-seven million, two hundred seventy-one thousand, fifty-five".