21121222221022 has 64 divisors (see below), whose sum is σ = 39817549578240. Its totient is φ = 8162795541600.

The previous prime is 21121222221017. The next prime is 21121222221083. The reversal of 21121222221022 is 22012222212112.

It is a super-3 number, since 3×21121222221022³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21121222220984 and 21121222221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112932247 + ... + 113119117.

It is an arithmetic number, because the mean of its divisors is an integer number (622149212160).

Almost surely, 2^{21121222221022} is an apocalyptic number.

21121222221022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121222221022 is a deficient number, since it is larger than the sum of its proper divisors (18696327357218).

21121222221022 is a wasteful number, since it uses less digits than its factorization.

21121222221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192797.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21121222221022 its reverse (22012222212112), we get a palindrome (43133444433134).

The spelling of 21121222221022 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-two".