1213401421 has 16 divisors (see below), whose sum is σ = 1267947520. Its totient is φ = 1160179200.

The previous prime is 1213401419. The next prime is 1213401463. The reversal of 1213401421 is 1241043121.

It is a cyclic number.

It is not a de Polignac number, because 1213401421 - 2¹ = 1213401419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213401481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540820 + ... + 543058.

It is an arithmetic number, because the mean of its divisors is an integer number (79246720).

Almost surely, 2^1213401421 is an apocalyptic number.

It is an amenable number.

1213401421 is a deficient number, since it is larger than the sum of its proper divisors (54546099).

1213401421 is a wasteful number, since it uses less digits than its factorization.

1213401421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1213401421 is about 34833.9119393731. The cubic root of 1213401421 is about 1066.5998044786.

Adding to 1213401421 its reverse (1241043121), we get a palindrome (2454444542).

The spelling of 1213401421 in words is "one billion, two hundred thirteen million, four hundred one thousand, four hundred twenty-one".