21020223142 has 8 divisors (see below), whose sum is σ = 32047225632. Its totient is φ = 10337814600.

The previous prime is 21020223139. The next prime is 21020223173. The reversal of 21020223142 is 24132202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86148334 + ... + 86148577.

It is an arithmetic number, because the mean of its divisors is an integer number (4005903204).

Almost surely, 2^21020223142 is an apocalyptic number.

21020223142 is a deficient number, since it is larger than the sum of its proper divisors (11027002490).

21020223142 is a wasteful number, since it uses less digits than its factorization.

21020223142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172296974.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21020223142 its reverse (24132202012), we get a palindrome (45152425154).

The spelling of 21020223142 in words is "twenty-one billion, twenty million, two hundred twenty-three thousand, one hundred forty-two".