21506201330136 has 64 divisors (see below), whose sum is σ = 54447144729600. Its totient is φ = 7077851808768.

The previous prime is 21506201330101. The next prime is 21506201330153. The reversal of 21506201330136 is 63103310260512.

It is a junction number, because it is equal to n+sod(n) for n = 21506201330097 and 21506201330106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151186101 + ... + 151328283.

It is an arithmetic number, because the mean of its divisors is an integer number (850736636400).

Almost surely, 2^{21506201330136} is an apocalyptic number.

It is an amenable number.

21506201330136 is an abundant number, since it is smaller than the sum of its proper divisors (32940943399464).

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

21506201330136 is a wasteful number, since it uses less digits than its factorization.

21506201330136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222048 (or 222044 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 21506201330136 its reverse (63103310260512), we get a palindrome (84609511590648).

The spelling of 21506201330136 in words is "twenty-one trillion, five hundred six billion, two hundred one million, three hundred thirty thousand, one hundred thirty-six".