21506065101235 has 16 divisors (see below), whose sum is σ = 30319040031840. Its totient is φ = 14437638109440.

The previous prime is 21506065101223. The next prime is 21506065101239. The reversal of 21506065101235 is 53210156060512.

It is a happy number.

It is not a de Polignac number, because 21506065101235 - 2¹⁹ = 21506064576947 is a prime.

It is a super-2 number, since 2×21506065101235² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21506065101194 and 21506065101203.

It is not an unprimeable number, because it can be changed into a prime (21506065101239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15039205650 + ... + 15039207079.

It is an arithmetic number, because the mean of its divisors is an integer number (1894940001990).

Almost surely, 2^{21506065101235} is an apocalyptic number.

21506065101235 is a deficient number, since it is larger than the sum of its proper divisors (8812974930605).

21506065101235 is a wasteful number, since it uses less digits than its factorization.

21506065101235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30078412758.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 21506065101235 in words is "twenty-one trillion, five hundred six billion, sixty-five million, one hundred one thousand, two hundred thirty-five".