21022022121 has 8 divisors (see below), whose sum is σ = 28052137344. Its totient is φ = 14003294160.

The previous prime is 21022022107. The next prime is 21022022239. The reversal of 21022022121 is 12122022012.

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

It is not a de Polignac number, because 21022022121 - 2¹¹ = 21022020073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022022121.

It is not an unprimeable number, because it can be changed into a prime (21022022101) 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, 2842506 + ... + 2849891.

It is an arithmetic number, because the mean of its divisors is an integer number (3506517168).

Almost surely, 2^21022022121 is an apocalyptic number.

It is an amenable number.

21022022121 is a deficient number, since it is larger than the sum of its proper divisors (7030115223).

21022022121 is a wasteful number, since it uses less digits than its factorization.

21022022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693631.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022022121 its reverse (12122022012), we get a palindrome (33144044133).

The spelling of 21022022121 in words is "twenty-one billion, twenty-two million, twenty-two thousand, one hundred twenty-one".