21122031442 has 8 divisors (see below), whose sum is σ = 31685383296. Its totient is φ = 10560237012.

The previous prime is 21122031407. The next prime is 21122031451. The reversal of 21122031442 is 24413022112.

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

It is a super-2 number, since 2×21122031442² (a number of 21 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, 354838 + ... + 410065.

It is an arithmetic number, because the mean of its divisors is an integer number (3960672912).

Almost surely, 2^21122031442 is an apocalyptic number.

21122031442 is a deficient number, since it is larger than the sum of its proper divisors (10563351854).

21122031442 is a wasteful number, since it uses less digits than its factorization.

21122031442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778712.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21122031442 its reverse (24413022112), we get a palindrome (45535053554).

The spelling of 21122031442 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, four hundred forty-two".