11543002421 has 2 divisors, whose sum is σ = 11543002422. Its totient is φ = 11543002420.

The previous prime is 11543002399. The next prime is 11543002463. The reversal of 11543002421 is 12420034511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10668617521 + 874384900 = 103289^2 + 29570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11543002421 - 2⁶ = 11543002357 is a prime.

It is a super-2 number, since 2×11543002421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11543002921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771501210 + 5771501211.

It is an arithmetic number, because the mean of its divisors is an integer number (5771501211).

Almost surely, 2^11543002421 is an apocalyptic number.

It is an amenable number.

11543002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543002421 is an equidigital number, since it uses as much as digits as its factorization.

11543002421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 11543002421 its reverse (12420034511), we get a palindrome (23963036932).

The spelling of 11543002421 in words is "eleven billion, five hundred forty-three million, two thousand, four hundred twenty-one".