21220143354442 has 8 divisors (see below), whose sum is σ = 33214137424416. Its totient is φ = 10148764212972.

The previous prime is 21220143354413. The next prime is 21220143354499. The reversal of 21220143354442 is 24445334102212.

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

It is a super-2 number, since 2×21220143354442² (a number of 27 digits) contains 22 as substring.

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, 230653732068 + ... + 230653732159.

It is an arithmetic number, because the mean of its divisors is an integer number (4151767178052).

Almost surely, 2^{21220143354442} is an apocalyptic number.

21220143354442 is a deficient number, since it is larger than the sum of its proper divisors (11993994069974).

21220143354442 is a wasteful number, since it uses less digits than its factorization.

21220143354442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461307464252.

The product of its (nonzero) digits is 184320, while the sum is 37.

Adding to 21220143354442 its reverse (24445334102212), we get a palindrome (45665477456654).

The spelling of 21220143354442 in words is "twenty-one trillion, two hundred twenty billion, one hundred forty-three million, three hundred fifty-four thousand, four hundred forty-two".