21121212202222 has 32 divisors (see below), whose sum is σ = 34852771010304. Its totient is φ = 9520096627200.

The previous prime is 21121212202133. The next prime is 21121212202271. The reversal of 21121212202222 is 22220221212112.

It is a super-2 number, since 2×21121212202222² (a number of 27 digits) contains 22 as substring.

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 = 21121212202193 and 21121212202202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6676888 + ... + 9317899.

It is an arithmetic number, because the mean of its divisors is an integer number (1089149094072).

Almost surely, 2^{21121212202222} is an apocalyptic number.

21121212202222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121212202222 is a deficient number, since it is larger than the sum of its proper divisors (13731558808082).

21121212202222 is a wasteful number, since it uses less digits than its factorization.

21121212202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15995304.

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

Adding to 21121212202222 its reverse (22220221212112), we get a palindrome (43341433414334).

The spelling of 21121212202222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred twenty-two".