21515348029050 has 72 divisors (see below), whose sum is σ = 57805159948380. Its totient is φ = 5737367424000.

The previous prime is 21515348029037. The next prime is 21515348029051. The reversal of 21515348029050 is 5092084351512.

21515348029050 is a `hidden beast` number, since 2 + 1 + 5 + 15 + 348 + 0 + 290 + 5 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 327748235049 + 21187599794001 = 572493^2 + 4602999^2 .

It is a super-2 number, since 2×21515348029050² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21515348028987 and 21515348029005.

It is not an unprimeable number, because it can be changed into a prime (21515348029051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60531850 + ... + 60886250.

Almost surely, 2^{21515348029050} is an apocalyptic number.

21515348029050 is an abundant number, since it is smaller than the sum of its proper divisors (36289811919330).

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

21515348029050 is a wasteful number, since it uses less digits than its factorization.

21515348029050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489328 (or 489320 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 21515348029050 in words is "twenty-one trillion, five hundred fifteen billion, three hundred forty-eight million, twenty-nine thousand, fifty".