21122002122021 has 24 divisors (see below), whose sum is σ = 30577441839360. Its totient is φ = 14050020856896.

The previous prime is 21122002121977. The next prime is 21122002122107. The reversal of 21122002122021 is 12022120022112.

It is a happy number.

21122002122021 is a `hidden beast` number, since 211 + 2 + 200 + 212 + 20 + 21 = 666.

It is not a de Polignac number, because 21122002122021 - 2¹⁰ = 21122002120997 is a prime.

It is a super-2 number, since 2×21122002122021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122002121985 and 21122002122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122002192021) 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, 14405580 + ... + 15803946.

It is an arithmetic number, because the mean of its divisors is an integer number (1274060076640).

Almost surely, 2^{21122002122021} is an apocalyptic number.

It is an amenable number.

21122002122021 is a deficient number, since it is larger than the sum of its proper divisors (9455439717339).

21122002122021 is a wasteful number, since it uses less digits than its factorization.

21122002122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402105 (or 1402102 counting only the distinct ones).

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

Adding to 21122002122021 its reverse (12022120022112), we get a palindrome (33144122144133).

The spelling of 21122002122021 in words is "twenty-one trillion, one hundred twenty-two billion, two million, one hundred twenty-two thousand, twenty-one".