1210020345 has 24 divisors (see below), whose sum is σ = 2100905352. Its totient is φ = 644256000.

The previous prime is 1210020337. The next prime is 1210020347. The reversal of 1210020345 is 5430200121.

It can be written as a sum of positive squares in 4 ways, for example, as 25765776 + 1184254569 = 5076^2 + 34413^2 .

It is not a de Polignac number, because 1210020345 - 2³ = 1210020337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210020347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4675 + ... + 49415.

It is an arithmetic number, because the mean of its divisors is an integer number (87537723).

Almost surely, 2^1210020345 is an apocalyptic number.

1210020345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1210020345 is a deficient number, since it is larger than the sum of its proper divisors (890885007).

1210020345 is a wasteful number, since it uses less digits than its factorization.

1210020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45353 (or 45350 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1210020345 is about 34785.3466994365. The cubic root of 1210020345 is about 1065.6082090961.

Adding to 1210020345 its reverse (5430200121), we get a palindrome (6640220466).

The spelling of 1210020345 in words is "one billion, two hundred ten million, twenty thousand, three hundred forty-five".