21421031122 has 4 divisors (see below), whose sum is σ = 32131546686. Its totient is φ = 10710515560.

The previous prime is 21421031081. The next prime is 21421031123. The reversal of 21421031122 is 22113012412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17030511001 + 4390520121 = 130501^2 + 66261^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21421031122.

It is not an unprimeable number, because it can be changed into a prime (21421031123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355257779 + ... + 5355257782.

Almost surely, 2^21421031122 is an apocalyptic number.

21421031122 is a deficient number, since it is larger than the sum of its proper divisors (10710515564).

21421031122 is a wasteful number, since it uses less digits than its factorization.

21421031122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10710515563.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21421031122 its reverse (22113012412), we get a palindrome (43534043534).

The spelling of 21421031122 in words is "twenty-one billion, four hundred twenty-one million, thirty-one thousand, one hundred twenty-two".