1212340021 has 8 divisors (see below), whose sum is σ = 1218966624. Its totient is φ = 1205730480.

The previous prime is 1212340013. The next prime is 1212340079. The reversal of 1212340021 is 1200432121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212340021 - 2³ = 1212340013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212339977 and 1212340004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212340121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153786 + ... + 161476.

It is an arithmetic number, because the mean of its divisors is an integer number (152370828).

Almost surely, 2^1212340021 is an apocalyptic number.

It is an amenable number.

1212340021 is a deficient number, since it is larger than the sum of its proper divisors (6626603).

1212340021 is an equidigital number, since it uses as much as digits as its factorization.

1212340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8531.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1212340021 is about 34818.6734526173. The cubic root of 1212340021 is about 1066.2887177367.

Adding to 1212340021 its reverse (1200432121), we get a palindrome (2412772142).

The spelling of 1212340021 in words is "one billion, two hundred twelve million, three hundred forty thousand, twenty-one".