21102315203135 has 16 divisors (see below), whose sum is σ = 25725610279776. Its totient is φ = 16613785317888.

The previous prime is 21102315203129. The next prime is 21102315203149. The reversal of 21102315203135 is 53130251320112.

It is a cyclic number.

It is not a de Polignac number, because 21102315203135 - 2²⁴ = 21102298425919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102315203098 and 21102315203107.

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, 30143774 + ... + 30835883.

It is an arithmetic number, because the mean of its divisors is an integer number (1607850642486).

Almost surely, 2^{21102315203135} is an apocalyptic number.

21102315203135 is a deficient number, since it is larger than the sum of its proper divisors (4623295076641).

21102315203135 is a wasteful number, since it uses less digits than its factorization.

21102315203135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60980762.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 21102315203135 its reverse (53130251320112), we get a palindrome (74232566523247).

The spelling of 21102315203135 in words is "twenty-one trillion, one hundred two billion, three hundred fifteen million, two hundred three thousand, one hundred thirty-five".