21142111402 has 4 divisors (see below), whose sum is σ = 31713167106. Its totient is φ = 10571055700.

The previous prime is 21142111399. The next prime is 21142111423. The reversal of 21142111402 is 20411124112.

It is a happy number.

21142111402 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20457294841 + 684816561 = 143029^2 + 26169^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21142111402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285527849 + ... + 5285527852.

Almost surely, 2^21142111402 is an apocalyptic number.

21142111402 is a deficient number, since it is larger than the sum of its proper divisors (10571055704).

21142111402 is a wasteful number, since it uses less digits than its factorization.

21142111402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10571055703.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21142111402 its reverse (20411124112), we get a palindrome (41553235514).

The spelling of 21142111402 in words is "twenty-one billion, one hundred forty-two million, one hundred eleven thousand, four hundred two".