21142111401 has 10 divisors (see below), whose sum is σ = 31582660362. Its totient is φ = 14094740880.

The previous prime is 21142111399. The next prime is 21142111423. The reversal of 21142111401 is 10411124112.

21142111401 is a `hidden beast` number, since 211 + 42 + 1 + 11 + 401 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19965690000 + 1176421401 = 141300^2 + 34299^2 .

It is not a de Polignac number, because 21142111401 - 2¹ = 21142111399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21142113401) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130506780 + ... + 130506941.

Almost surely, 2^21142111401 is an apocalyptic number.

It is an amenable number.

21142111401 is a deficient number, since it is larger than the sum of its proper divisors (10440548961).

21142111401 is an equidigital number, since it uses as much as digits as its factorization.

21142111401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261013733 (or 261013724 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21142111401 its reverse (10411124112), we get a palindrome (31553235513).

The spelling of 21142111401 in words is "twenty-one billion, one hundred forty-two million, one hundred eleven thousand, four hundred one".