21002121210222 has 48 divisors (see below), whose sum is σ = 48077640234000. Its totient is φ = 6607593574272.

The previous prime is 21002121210209. The next prime is 21002121210253. The reversal of 21002121210222 is 22201212120012.

It is a happy number.

21002121210222 is a `hidden beast` number, since 21 + 0 + 0 + 212 + 1 + 210 + 222 = 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 = 21002121210195 and 21002121210204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114052447 + ... + 114236442.

It is an arithmetic number, because the mean of its divisors is an integer number (1001617504875).

Almost surely, 2^{21002121210222} is an apocalyptic number.

21002121210222 is an abundant number, since it is smaller than the sum of its proper divisors (27075519023778).

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

21002121210222 is a wasteful number, since it uses less digits than its factorization.

21002121210222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228289185 (or 228289182 counting only the distinct ones).

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

Adding to 21002121210222 its reverse (22201212120012), we get a palindrome (43203333330234).

The spelling of 21002121210222 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-two".