21022030121 has 4 divisors (see below), whose sum is σ = 21042661200. Its totient is φ = 21001399044.

The previous prime is 21022030091. The next prime is 21022030123. The reversal of 21022030121 is 12103022012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022030121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022030096 and 21022030105.

It is not an unprimeable number, because it can be changed into a prime (21022030123) 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, 10314011 + ... + 10316048.

It is an arithmetic number, because the mean of its divisors is an integer number (5260665300).

Almost surely, 2^21022030121 is an apocalyptic number.

It is an amenable number.

21022030121 is a deficient number, since it is larger than the sum of its proper divisors (20631079).

21022030121 is a wasteful number, since it uses less digits than its factorization.

21022030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20631078.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21022030121 its reverse (12103022012), we get a palindrome (33125052133).

The spelling of 21022030121 in words is "twenty-one billion, twenty-two million, thirty thousand, one hundred twenty-one".