21022000121 has 8 divisors (see below), whose sum is σ = 22164298080. Its totient is φ = 19883289888.

The previous prime is 21022000091. The next prime is 21022000123. The reversal of 21022000121 is 12100022012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21022000121 - 2¹⁸ = 21021737977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022000123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884891 + ... + 908336.

It is an arithmetic number, because the mean of its divisors is an integer number (2770537260).

Almost surely, 2^21022000121 is an apocalyptic number.

It is an amenable number.

21022000121 is a deficient number, since it is larger than the sum of its proper divisors (1142297959).

21022000121 is a wasteful number, since it uses less digits than its factorization.

21022000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793863.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21022000121 its reverse (12100022012), we get a palindrome (33122022133).

The spelling of 21022000121 in words is "twenty-one billion, twenty-two million, one hundred twenty-one", and thus it is an aban number.