1212213021 has 8 divisors (see below), whose sum is σ = 1672018080. Its totient is φ = 780274992.

The previous prime is 1212213007. The next prime is 1212213029. The reversal of 1212213021 is 1203122121.

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

It is not a de Polignac number, because 1212213021 - 2¹⁵ = 1212180253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212213029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6966655 + ... + 6966828.

It is an arithmetic number, because the mean of its divisors is an integer number (209002260).

Almost surely, 2^1212213021 is an apocalyptic number.

It is an amenable number.

1212213021 is a deficient number, since it is larger than the sum of its proper divisors (459805059).

1212213021 is a wasteful number, since it uses less digits than its factorization.

1212213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13933515.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212213021 is about 34816.8496708131. The cubic root of 1212213021 is about 1066.2514830243.

Adding to 1212213021 its reverse (1203122121), we get a palindrome (2415335142).

The spelling of 1212213021 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, twenty-one".