1081236421 has 2 divisors, whose sum is σ = 1081236422. Its totient is φ = 1081236420.

The previous prime is 1081236349. The next prime is 1081236427. The reversal of 1081236421 is 1246321801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912885796 + 168350625 = 30214^2 + 12975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081236421 - 2¹⁷ = 1081105349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1081236421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081236427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540618210 + 540618211.

It is an arithmetic number, because the mean of its divisors is an integer number (540618211).

Almost surely, 2^1081236421 is an apocalyptic number.

It is an amenable number.

1081236421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081236421 is an equidigital number, since it uses as much as digits as its factorization.

1081236421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1081236421 is about 32882.1596158160. The cubic root of 1081236421 is about 1026.3769464987.

The spelling of 1081236421 in words is "one billion, eighty-one million, two hundred thirty-six thousand, four hundred twenty-one".