21354736651427 has 4 divisors (see below), whose sum is σ = 21360010732200. Its totient is φ = 21349462570656.

The previous prime is 21354736651399. The next prime is 21354736651477. The reversal of 21354736651427 is 72415663745312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21354736651427 - 2⁶ = 21354736651363 is a prime.

It is a super-2 number, since 2×21354736651427² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354736651477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2637034313 + ... + 2637042410.

It is an arithmetic number, because the mean of its divisors is an integer number (5340002683050).

Almost surely, 2^{21354736651427} is an apocalyptic number.

21354736651427 is a deficient number, since it is larger than the sum of its proper divisors (5274080773).

21354736651427 is an equidigital number, since it uses as much as digits as its factorization.

21354736651427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274080772.

The product of its digits is 25401600, while the sum is 56.

The spelling of 21354736651427 in words is "twenty-one trillion, three hundred fifty-four billion, seven hundred thirty-six million, six hundred fifty-one thousand, four hundred twenty-seven".