745431224423021 has 4 divisors (see below), whose sum is σ = 746378405140992. Its totient is φ = 744484043705052.

The previous prime is 745431224423003. The next prime is 745431224423077. The reversal of 745431224423021 is 120324422134547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745431224423021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745431224443021) 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, 473590357805 + ... + 473590359378.

It is an arithmetic number, because the mean of its divisors is an integer number (186594601285248).

Almost surely, 2^{745431224423021} is an apocalyptic number.

It is an amenable number.

745431224423021 is a deficient number, since it is larger than the sum of its proper divisors (947180717971).

745431224423021 is an equidigital number, since it uses as much as digits as its factorization.

745431224423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947180717970.

The product of its (nonzero) digits is 1290240, while the sum is 44.

Adding to 745431224423021 its reverse (120324422134547), we get a palindrome (865755646557568).

The spelling of 745431224423021 in words is "seven hundred forty-five trillion, four hundred thirty-one billion, two hundred twenty-four million, four hundred twenty-three thousand, twenty-one".