1201626421 has 4 divisors (see below), whose sum is σ = 1253871072. Its totient is φ = 1149381772.

The previous prime is 1201626407. The next prime is 1201626427. The reversal of 1201626421 is 1246261021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1246261021 = 14159 ⋅88019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201626421 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 (1201626427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26122291 + ... + 26122336.

It is an arithmetic number, because the mean of its divisors is an integer number (313467768).

Almost surely, 2^1201626421 is an apocalyptic number.

It is an amenable number.

1201626421 is a deficient number, since it is larger than the sum of its proper divisors (52244651).

1201626421 is an equidigital number, since it uses as much as digits as its factorization.

1201626421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52244650.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1201626421 is about 34664.4835674787. The cubic root of 1201626421 is about 1063.1384441740.

Adding to 1201626421 its reverse (1246261021), we get a palindrome (2447887442).

The spelling of 1201626421 in words is "one billion, two hundred one million, six hundred twenty-six thousand, four hundred twenty-one".