21354742540607 has 8 divisors (see below), whose sum is σ = 24972987954816. Its totient is φ = 17878389103512.

The previous prime is 21354742540597. The next prime is 21354742540661. The reversal of 21354742540607 is 70604524745312.

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

It is not a de Polignac number, because 21354742540607 - 2²⁰ = 21354741492031 is a prime.

It is a super-2 number, since 2×21354742540607² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354742540697) 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, 35472993953 + ... + 35472994554.

It is an arithmetic number, because the mean of its divisors is an integer number (3121623494352).

Almost surely, 2^{21354742540607} is an apocalyptic number.

21354742540607 is a deficient number, since it is larger than the sum of its proper divisors (3618245414209).

21354742540607 is an equidigital number, since it uses as much as digits as its factorization.

21354742540607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70945988557.

The product of its (nonzero) digits is 5644800, while the sum is 50.

The spelling of 21354742540607 in words is "twenty-one trillion, three hundred fifty-four billion, seven hundred forty-two million, five hundred forty thousand, six hundred seven".