1821212514 has 48 divisors (see below), whose sum is σ = 4336169760. Its totient is φ = 547846080.

The previous prime is 1821212513. The next prime is 1821212527. The reversal of 1821212514 is 4152121281.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1821212513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6444 + ... + 60695.

It is an arithmetic number, because the mean of its divisors is an integer number (90336870).

Almost surely, 2^1821212514 is an apocalyptic number.

1821212514 is an abundant number, since it is smaller than the sum of its proper divisors (2514957246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821212514 is a wasteful number, since it uses less digits than its factorization.

1821212514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67295 (or 67292 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1821212514 is about 42675.6665325804. Note that the first 3 decimals coincide. The cubic root of 1821212514 is about 1221.2002239326.

Adding to 1821212514 its reverse (4152121281), we get a palindrome (5973333795).

The spelling of 1821212514 in words is "one billion, eight hundred twenty-one million, two hundred twelve thousand, five hundred fourteen".