21620061012135 has 32 divisors (see below), whose sum is σ = 34651205664768. Its totient is φ = 11511013356800.

The previous prime is 21620061012091. The next prime is 21620061012191. The reversal of 21620061012135 is 53121016002612.

It is not a de Polignac number, because 21620061012135 - 2¹⁷ = 21620060881063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20072314 + ... + 21121976.

It is an arithmetic number, because the mean of its divisors is an integer number (1082850177024).

Almost surely, 2^{21620061012135} is an apocalyptic number.

21620061012135 is a deficient number, since it is larger than the sum of its proper divisors (13031144652633).

21620061012135 is a wasteful number, since it uses less digits than its factorization.

21620061012135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052015.

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 21620061012135 its reverse (53121016002612), we get a palindrome (74741077014747).

The spelling of 21620061012135 in words is "twenty-one trillion, six hundred twenty billion, sixty-one million, twelve thousand, one hundred thirty-five".