21356054377 has 8 divisors (see below), whose sum is σ = 24410903616. Its totient is φ = 18302201232.

The previous prime is 21356054353. The next prime is 21356054389. The reversal of 21356054377 is 77345065312.

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

It is not a de Polignac number, because 21356054377 - 2¹⁹ = 21355530089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21356054327) 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, 202498 + ... + 289339.

It is an arithmetic number, because the mean of its divisors is an integer number (3051362952).

Almost surely, 2^21356054377 is an apocalyptic number.

It is an amenable number.

21356054377 is a deficient number, since it is larger than the sum of its proper divisors (3054849239).

21356054377 is an equidigital number, since it uses as much as digits as its factorization.

21356054377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498047.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 21356054377 in words is "twenty-one billion, three hundred fifty-six million, fifty-four thousand, three hundred seventy-seven".