21211140142 has 32 divisors (see below), whose sum is σ = 33882574752. Its totient is φ = 9924271104.

The previous prime is 21211140107. The next prime is 21211140157. The reversal of 21211140142 is 24104111212.

It is a happy number.

It is a super-2 number, since 2×21211140142² (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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7816978 + ... + 7819690.

It is an arithmetic number, because the mean of its divisors is an integer number (1058830461).

Almost surely, 2^21211140142 is an apocalyptic number.

21211140142 is a deficient number, since it is larger than the sum of its proper divisors (12671434610).

21211140142 is a wasteful number, since it uses less digits than its factorization.

21211140142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972.

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

Adding to 21211140142 its reverse (24104111212), we get a palindrome (45315251354).

The spelling of 21211140142 in words is "twenty-one billion, two hundred eleven million, one hundred forty thousand, one hundred forty-two".