1213542421 has 8 divisors (see below), whose sum is σ = 1493590784. Its totient is φ = 960165360.

The previous prime is 1213542413. The next prime is 1213542443. The reversal of 1213542421 is 1242453121.

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

It is not a de Polignac number, because 1213542421 - 2³ = 1213542413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213542401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6667725 + ... + 6667906.

It is an arithmetic number, because the mean of its divisors is an integer number (186698848).

Almost surely, 2^1213542421 is an apocalyptic number.

It is an amenable number.

1213542421 is a deficient number, since it is larger than the sum of its proper divisors (280048363).

1213542421 is a wasteful number, since it uses less digits than its factorization.

1213542421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13335651.

The product of its digits is 1920, while the sum is 25.

The square root of 1213542421 is about 34835.9357704081. The cubic root of 1213542421 is about 1066.6411166515.

Adding to 1213542421 its reverse (1242453121), we get a palindrome (2455995542).

The spelling of 1213542421 in words is "one billion, two hundred thirteen million, five hundred forty-two thousand, four hundred twenty-one".