21212011052 has 48 divisors (see below), whose sum is σ = 40397198688. Its totient is φ = 9705047040.

The previous prime is 21212011021. The next prime is 21212011057. The reversal of 21212011052 is 25011021212.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21212011052.

It is not an unprimeable number, because it can be changed into a prime (21212011057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4795802 + ... + 4800222.

It is an arithmetic number, because the mean of its divisors is an integer number (841608306).

Almost surely, 2^21212011052 is an apocalyptic number.

It is an amenable number.

21212011052 is a deficient number, since it is larger than the sum of its proper divisors (19185187636).

21212011052 is a wasteful number, since it uses less digits than its factorization.

21212011052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6386 (or 6384 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21212011052 its reverse (25011021212), we get a palindrome (46223032264).

The spelling of 21212011052 in words is "twenty-one billion, two hundred twelve million, eleven thousand, fifty-two".