421904190545 has 8 divisors (see below), whose sum is σ = 506296305960. Its totient is φ = 337515834240.

The previous prime is 421904190517. The next prime is 421904190559. The reversal of 421904190545 is 545091409124.

It can be written as a sum of positive squares in 4 ways, for example, as 291682085776 + 130222104769 = 540076^2 + 360863^2 .

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

It is not a de Polignac number, because 421904190545 - 2¹² = 421904186449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421904190496 and 421904190505.

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, 686660 + ... + 1146869.

It is an arithmetic number, because the mean of its divisors is an integer number (63287038245).

Almost surely, 2^421904190545 is an apocalyptic number.

It is an amenable number.

421904190545 is a deficient number, since it is larger than the sum of its proper divisors (84392115415).

421904190545 is a wasteful number, since it uses less digits than its factorization.

421904190545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879555.

The product of its (nonzero) digits is 259200, while the sum is 44.

Adding to 421904190545 its reverse (545091409124), we get a palindrome (966995599669).

The spelling of 421904190545 in words is "four hundred twenty-one billion, nine hundred four million, one hundred ninety thousand, five hundred forty-five".