21223545142 has 8 divisors (see below), whose sum is σ = 31986196632. Its totient is φ = 10561479600.

The previous prime is 21223545139. The next prime is 21223545143. The reversal of 21223545142 is 24154532212.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223545143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25145959 + ... + 25146802.

It is an arithmetic number, because the mean of its divisors is an integer number (3998274579).

Almost surely, 2^21223545142 is an apocalyptic number.

21223545142 is a deficient number, since it is larger than the sum of its proper divisors (10762651490).

21223545142 is a wasteful number, since it uses less digits than its factorization.

21223545142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50292974.

The product of its digits is 19200, while the sum is 31.

The spelling of 21223545142 in words is "twenty-one billion, two hundred twenty-three million, five hundred forty-five thousand, one hundred forty-two".