1421205545 has 4 divisors (see below), whose sum is σ = 1705446660. Its totient is φ = 1136964432.

The previous prime is 1421205521. The next prime is 1421205587. The reversal of 1421205545 is 5455021241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187580416 + 1233625129 = 13696^2 + 35123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421205545 - 2²⁴ = 1404428329 is a prime.

It is a super-2 number, since 2×1421205545² = 4039650402277494050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142120550 + ... + 142120559.

It is an arithmetic number, because the mean of its divisors is an integer number (426361665).

Almost surely, 2^1421205545 is an apocalyptic number.

It is an amenable number.

1421205545 is a deficient number, since it is larger than the sum of its proper divisors (284241115).

1421205545 is an equidigital number, since it uses as much as digits as its factorization.

1421205545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284241114.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 1421205545 is about 37698.8798905219. The cubic root of 1421205545 is about 1124.3088548226.

Adding to 1421205545 its reverse (5455021241), we get a palindrome (6876226786).

The spelling of 1421205545 in words is "one billion, four hundred twenty-one million, two hundred five thousand, five hundred forty-five".