1201421421 has 12 divisors (see below), whose sum is σ = 1761288672. Its totient is φ = 788992776.

The previous prime is 1201421393. The next prime is 1201421423. The reversal of 1201421421 is 1241241021.

1201421421 is a `hidden beast` number, since 1 + 201 + 42 + 1 + 421 = 666.

It is not a de Polignac number, because 1201421421 - 2¹⁸ = 1201159277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201421394 and 1201421403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201421423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 995601 + ... + 996806.

It is an arithmetic number, because the mean of its divisors is an integer number (146774056).

Almost surely, 2^1201421421 is an apocalyptic number.

It is an amenable number.

1201421421 is a deficient number, since it is larger than the sum of its proper divisors (559867251).

1201421421 is a wasteful number, since it uses less digits than its factorization.

1201421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992480 (or 1992477 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1201421421 is about 34661.5265243757. The cubic root of 1201421421 is about 1063.0779828491.

Adding to 1201421421 its reverse (1241241021), we get a palindrome (2442662442).

The spelling of 1201421421 in words is "one billion, two hundred one million, four hundred twenty-one thousand, four hundred twenty-one".