1881262421 has 4 divisors (see below), whose sum is σ = 1881387852. Its totient is φ = 1881136992.

The previous prime is 1881262417. The next prime is 1881262477. The reversal of 1881262421 is 1242621881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242621881 = 5417 ⋅229393.

It can be written as a sum of positive squares in 2 ways, for example, as 1626508900 + 254753521 = 40330^2 + 15961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881262421 - 2² = 1881262417 is a prime.

It is a super-3 number, since 3×1881262421³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881262121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36590 + ... + 71423.

It is an arithmetic number, because the mean of its divisors is an integer number (470346963).

Almost surely, 2^1881262421 is an apocalyptic number.

It is an amenable number.

1881262421 is a deficient number, since it is larger than the sum of its proper divisors (125431).

1881262421 is a wasteful number, since it uses less digits than its factorization.

1881262421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125430.

The product of its digits is 12288, while the sum is 35.

The square root of 1881262421 is about 43373.5221189149. The cubic root of 1881262421 is about 1234.4773523213.

The spelling of 1881262421 in words is "one billion, eight hundred eighty-one million, two hundred sixty-two thousand, four hundred twenty-one".