21477627293 has 2 divisors, whose sum is σ = 21477627294. Its totient is φ = 21477627292.

The previous prime is 21477627289. The next prime is 21477627319. The reversal of 21477627293 is 39272677412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16934597689 + 4543029604 = 130133^2 + 67402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21477627293 - 2² = 21477627289 is a prime.

It is a super-2 number, since 2×21477627293² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21477627233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738813646 + 10738813647.

It is an arithmetic number, because the mean of its divisors is an integer number (10738813647).

Almost surely, 2^21477627293 is an apocalyptic number.

It is an amenable number.

21477627293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21477627293 is an equidigital number, since it uses as much as digits as its factorization.

21477627293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 50.

The spelling of 21477627293 in words is "twenty-one billion, four hundred seventy-seven million, six hundred twenty-seven thousand, two hundred ninety-three".