21202105652 has 96 divisors (see below), whose sum is σ = 47416018944. Its totient is φ = 8069414400.

The previous prime is 21202105651. The next prime is 21202105669. The reversal of 21202105652 is 25650120212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202105651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1946702 + ... + 1957562.

It is an arithmetic number, because the mean of its divisors is an integer number (493916864).

Almost surely, 2^21202105652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202105652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708009472).

21202105652 is an abundant number, since it is smaller than the sum of its proper divisors (26213913292).

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

21202105652 is a wasteful number, since it uses less digits than its factorization.

21202105652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11089 (or 11087 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21202105652 its reverse (25650120212), we get a palindrome (46852225864).

The spelling of 21202105652 in words is "twenty-one billion, two hundred two million, one hundred five thousand, six hundred fifty-two".