21212241022 has 48 divisors (see below), whose sum is σ = 38984757840. Its totient is φ = 8607295872.

The previous prime is 21212240989. The next prime is 21212241049. The reversal of 21212241022 is 22014221212.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 5205978 + ... + 5210050.

It is an arithmetic number, because the mean of its divisors is an integer number (812182455).

Almost surely, 2^21212241022 is an apocalyptic number.

21212241022 is a deficient number, since it is larger than the sum of its proper divisors (17772516818).

21212241022 is a wasteful number, since it uses less digits than its factorization.

21212241022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6905 (or 6898 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21212241022 its reverse (22014221212), we get a palindrome (43226462234).

The spelling of 21212241022 in words is "twenty-one billion, two hundred twelve million, two hundred forty-one thousand, twenty-two".