21051052350 has 24 divisors (see below), whose sum is σ = 52206610200. Its totient is φ = 5613613920.

The previous prime is 21051052339. The next prime is 21051052367. The reversal of 21051052350 is 5325015012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21051052350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70170025 + ... + 70170324.

It is an arithmetic number, because the mean of its divisors is an integer number (2175275425).

Almost surely, 2^21051052350 is an apocalyptic number.

21051052350 is an abundant number, since it is smaller than the sum of its proper divisors (31155557850).

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

21051052350 is a wasteful number, since it uses less digits than its factorization.

21051052350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140340364 (or 140340359 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 21051052350 its reverse (5325015012), we get a palindrome (26376067362).

The spelling of 21051052350 in words is "twenty-one billion, fifty-one million, fifty-two thousand, three hundred fifty".