1199931421 has 4 divisors (see below), whose sum is σ = 1292233852. Its totient is φ = 1107628992.

The previous prime is 1199931401. The next prime is 1199931443. The reversal of 1199931421 is 1241399911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241399911 = 28027 ⋅44293.

It can be written as a sum of positive squares in 2 ways, for example, as 134235396 + 1065696025 = 11586^2 + 32645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199931421 - 2⁹ = 1199930909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199931401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46151196 + ... + 46151221.

It is an arithmetic number, because the mean of its divisors is an integer number (323058463).

Almost surely, 2^1199931421 is an apocalyptic number.

It is an amenable number.

1199931421 is a deficient number, since it is larger than the sum of its proper divisors (92302431).

1199931421 is an equidigital number, since it uses as much as digits as its factorization.

1199931421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92302430.

The product of its digits is 17496, while the sum is 40.

The square root of 1199931421 is about 34640.0262846321. The cubic root of 1199931421 is about 1062.6383254464.

The spelling of 1199931421 in words is "one billion, one hundred ninety-nine million, nine hundred thirty-one thousand, four hundred twenty-one".