21477627309 has 8 divisors (see below), whose sum is σ = 29881916352. Its totient is φ = 13695878240.

The previous prime is 21477627293. The next prime is 21477627319. The reversal of 21477627309 is 90372677412.

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

It is a cyclic number.

It is not a de Polignac number, because 21477627309 - 2⁴ = 21477627293 is a prime.

It is a super-2 number, since 2×21477627309² (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 (21477627319) 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, 155634912 + ... + 155635049.

It is an arithmetic number, because the mean of its divisors is an integer number (3735239544).

Almost surely, 2^21477627309 is an apocalyptic number.

It is an amenable number.

21477627309 is a deficient number, since it is larger than the sum of its proper divisors (8404289043).

21477627309 is a wasteful number, since it uses less digits than its factorization.

21477627309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311269987.

The product of its (nonzero) digits is 889056, while the sum is 48.

The spelling of 21477627309 in words is "twenty-one billion, four hundred seventy-seven million, six hundred twenty-seven thousand, three hundred nine".