21315010050 has 72 divisors (see below), whose sum is σ = 57956384304. Its totient is φ = 5615510880.

The previous prime is 21315009979. The next prime is 21315010069. The reversal of 21315010050 is 5001051312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 247992 + ... + 322691.

It is an arithmetic number, because the mean of its divisors is an integer number (804949782).

Almost surely, 2^21315010050 is an apocalyptic number.

21315010050 is an abundant number, since it is smaller than the sum of its proper divisors (36641374254).

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

21315010050 is a wasteful number, since it uses less digits than its factorization.

21315010050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570784 (or 570776 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

Adding to 21315010050 its reverse (5001051312), we get a palindrome (26316061362).

The spelling of 21315010050 in words is "twenty-one billion, three hundred fifteen million, ten thousand, fifty".