21143021043142 has 128 divisors (see below), whose sum is σ = 35625073397760. Its totient is φ = 9371930843520.

The previous prime is 21143021043121. The next prime is 21143021043197. The reversal of 21143021043142 is 24134012034112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21143021043142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1080314217 + ... + 1080333787.

It is an arithmetic number, because the mean of its divisors is an integer number (278320885920).

Almost surely, 2^{21143021043142} is an apocalyptic number.

21143021043142 is a deficient number, since it is larger than the sum of its proper divisors (14482052354618).

21143021043142 is a wasteful number, since it uses less digits than its factorization.

21143021043142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19946.

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

Adding to 21143021043142 its reverse (24134012034112), we get a palindrome (45277033077254).

The spelling of 21143021043142 in words is "twenty-one trillion, one hundred forty-three billion, twenty-one million, forty-three thousand, one hundred forty-two".