21354425245 has 8 divisors (see below), whose sum is σ = 26045397720. Its totient is φ = 16803481920.

The previous prime is 21354425221. The next prime is 21354425327. The reversal of 21354425245 is 54252445312.

It can be written as a sum of positive squares in 4 ways, for example, as 25867396 + 21328557849 = 5086^2 + 146043^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-21354425245 is a prime.

It is a super-2 number, since 2×21354425245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35006950 + ... + 35007559.

It is an arithmetic number, because the mean of its divisors is an integer number (3255674715).

Almost surely, 2^21354425245 is an apocalyptic number.

It is an amenable number.

21354425245 is a deficient number, since it is larger than the sum of its proper divisors (4690972475).

21354425245 is an equidigital number, since it uses as much as digits as its factorization.

21354425245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70014575.

The product of its digits is 192000, while the sum is 37.

The spelling of 21354425245 in words is "twenty-one billion, three hundred fifty-four million, four hundred twenty-five thousand, two hundred forty-five".