21771413455 has 32 divisors (see below), whose sum is σ = 29505254400. Its totient is φ = 15276508800.

The previous prime is 21771413431. The next prime is 21771413467. The reversal of 21771413455 is 55431417712.

It is not a de Polignac number, because 21771413455 - 2¹⁷ = 21771282383 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2578090 + ... + 2586520.

It is an arithmetic number, because the mean of its divisors is an integer number (922039200).

Almost surely, 2^21771413455 is an apocalyptic number.

21771413455 is a deficient number, since it is larger than the sum of its proper divisors (7733840945).

21771413455 is a wasteful number, since it uses less digits than its factorization.

21771413455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10095.

The product of its digits is 117600, while the sum is 40.

The spelling of 21771413455 in words is "twenty-one billion, seven hundred seventy-one million, four hundred thirteen thousand, four hundred fifty-five".