21142043401231 has 2 divisors, whose sum is σ = 21142043401232. Its totient is φ = 21142043401230.

The previous prime is 21142043401223. The next prime is 21142043401267. The reversal of 21142043401231 is 13210434024112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21142043401231 - 2³ = 21142043401223 is a prime.

It is a super-2 number, since 2×21142043401231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21142043401231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142043404231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571021700615 + 10571021700616.

It is an arithmetic number, because the mean of its divisors is an integer number (10571021700616).

Almost surely, 2^{21142043401231} is an apocalyptic number.

21142043401231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142043401231 is an equidigital number, since it uses as much as digits as its factorization.

21142043401231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21142043401231 its reverse (13210434024112), we get a palindrome (34352477425343).

The spelling of 21142043401231 in words is "twenty-one trillion, one hundred forty-two billion, forty-three million, four hundred one thousand, two hundred thirty-one".