42897221447 has 4 divisors (see below), whose sum is σ = 44281002816. Its totient is φ = 41513440080.

The previous prime is 42897221429. The next prime is 42897221453. The reversal of 42897221447 is 74412279824.

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 42897221447 - 2¹⁴ = 42897205063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42897221395 and 42897221404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42897221467) 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, 691890638 + ... + 691890699.

It is an arithmetic number, because the mean of its divisors is an integer number (11070250704).

Almost surely, 2^42897221447 is an apocalyptic number.

42897221447 is a deficient number, since it is larger than the sum of its proper divisors (1383781369).

42897221447 is a wasteful number, since it uses less digits than its factorization.

42897221447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383781368.

The product of its digits is 1806336, while the sum is 50.

The spelling of 42897221447 in words is "forty-two billion, eight hundred ninety-seven million, two hundred twenty-one thousand, four hundred forty-seven".