21022021210122 has 24 divisors (see below), whose sum is σ = 45548796593664. Its totient is φ = 7007173638504.

The previous prime is 21022021210121. The next prime is 21022021210129. The reversal of 21022021210122 is 22101212022012.

It is a happy number.

21022021210122 is a `hidden beast` number, since 210 + 220 + 2 + 1 + 210 + 1 + 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 = 21022021210095 and 21022021210104.

It is not an unprimeable number, because it can be changed into a prime (21022021210121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13118538 + ... + 14633525.

It is an arithmetic number, because the mean of its divisors is an integer number (1897866524736).

Almost surely, 2^{21022021210122} is an apocalyptic number.

21022021210122 is an abundant number, since it is smaller than the sum of its proper divisors (24526775383542).

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

21022021210122 is a wasteful number, since it uses less digits than its factorization.

21022021210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27794154 (or 27794151 counting only the distinct ones).

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

Adding to 21022021210122 its reverse (22101212022012), we get a palindrome (43123233232134).

The spelling of 21022021210122 in words is "twenty-one trillion, twenty-two billion, twenty-one million, two hundred ten thousand, one hundred twenty-two".