21402111142 has 16 divisors (see below), whose sum is σ = 33143432832. Its totient is φ = 10354397760.

The previous prime is 21402111113. The next prime is 21402111209. The reversal of 21402111142 is 24111120412.

It is a happy number.

It is a super-2 number, since 2×21402111142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512938 + ... + 553090.

It is an arithmetic number, because the mean of its divisors is an integer number (2071464552).

Almost surely, 2^21402111142 is an apocalyptic number.

21402111142 is a deficient number, since it is larger than the sum of its proper divisors (11741321690).

21402111142 is a wasteful number, since it uses less digits than its factorization.

21402111142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48783.

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

Adding to 21402111142 its reverse (24111120412), we get a palindrome (45513231554).

The spelling of 21402111142 in words is "twenty-one billion, four hundred two million, one hundred eleven thousand, one hundred forty-two".