21212122030 has 32 divisors (see below), whose sum is σ = 42668827488. Its totient is φ = 7525363200.

The previous prime is 21212122027. The next prime is 21212122039. The reversal of 21212122030 is 3022121212.

It is a happy number.

It is a super-2 number, since 2×21212122030² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212121995 and 21212122013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212122039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2347167 + ... + 2356186.

It is an arithmetic number, because the mean of its divisors is an integer number (1333400859).

Almost surely, 2^21212122030 is an apocalyptic number.

21212122030 is an abundant number, since it is smaller than the sum of its proper divisors (21456705458).

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

21212122030 is a wasteful number, since it uses less digits than its factorization.

21212122030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703412.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212122030 its reverse (3022121212), we get a palindrome (24234243242).

The spelling of 21212122030 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, thirty".