1521420345 has 48 divisors (see below), whose sum is σ = 2791713600. Its totient is φ = 764346240.

The previous prime is 1521420343. The next prime is 1521420347. The reversal of 1521420345 is 5430241251.

It is an interprime number because it is at equal distance from previous prime (1521420343) and next prime (1521420347).

It is not a de Polignac number, because 1521420345 - 2¹ = 1521420343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521420343) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148075 + ... + 158015.

It is an arithmetic number, because the mean of its divisors is an integer number (58160700).

Almost surely, 2^1521420345 is an apocalyptic number.

1521420345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1521420345 is a deficient number, since it is larger than the sum of its proper divisors (1270293255).

1521420345 is a wasteful number, since it uses less digits than its factorization.

1521420345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150 (or 10147 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1521420345 is about 39005.3886661830. The cubic root of 1521420345 is about 1150.1374366304.

Adding to 1521420345 its reverse (5430241251), we get a palindrome (6951661596).

The spelling of 1521420345 in words is "one billion, five hundred twenty-one million, four hundred twenty thousand, three hundred forty-five".