21221001022122 has 48 divisors (see below), whose sum is σ = 52798662839520. Its totient is φ = 6092153402400.

The previous prime is 21221001022121. The next prime is 21221001022127. The reversal of 21221001022122 is 22122010012212.

It is a happy number.

21221001022122 is a `hidden beast` number, since 212 + 210 + 0 + 1 + 0 + 221 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21221001022095 and 21221001022104.

It is not an unprimeable number, because it can be changed into a prime (21221001022121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2820437629 + ... + 2820445152.

It is an arithmetic number, because the mean of its divisors is an integer number (1099972142490).

Almost surely, 2^{21221001022122} is an apocalyptic number.

21221001022122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221001022122 is an abundant number, since it is smaller than the sum of its proper divisors (31577661817398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221001022122 is a wasteful number, since it uses less digits than its factorization.

21221001022122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640882819 (or 5640882816 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221001022122 its reverse (22122010012212), we get a palindrome (43343011034334).

The spelling of 21221001022122 in words is "twenty-one trillion, two hundred twenty-one billion, one million, twenty-two thousand, one hundred twenty-two".