21010221052 has 48 divisors (see below), whose sum is σ = 41033744640. Its totient is φ = 9354431232.

The previous prime is 21010220999. The next prime is 21010221053. The reversal of 21010221052 is 25012201012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010221053) 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, 1006473 + ... + 1027135.

It is an arithmetic number, because the mean of its divisors is an integer number (854869680).

Almost surely, 2^21010221052 is an apocalyptic number.

It is an amenable number.

21010221052 is a deficient number, since it is larger than the sum of its proper divisors (20023523588).

21010221052 is a wasteful number, since it uses less digits than its factorization.

21010221052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21490 (or 21488 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21010221052 its reverse (25012201012), we get a palindrome (46022422064).

The spelling of 21010221052 in words is "twenty-one billion, ten million, two hundred twenty-one thousand, fifty-two".