21145122035 has 16 divisors (see below), whose sum is σ = 25513012800. Its totient is φ = 16823769216.

The previous prime is 21145122029. The next prime is 21145122043. The reversal of 21145122035 is 53022154112.

It is a cyclic number.

It is not a de Polignac number, because 21145122035 - 2⁸ = 21145121779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21145121995 and 21145122013.

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, 680621 + ... + 711009.

It is an arithmetic number, because the mean of its divisors is an integer number (1594563300).

Almost surely, 2^21145122035 is an apocalyptic number.

21145122035 is a deficient number, since it is larger than the sum of its proper divisors (4367890765).

21145122035 is a wasteful number, since it uses less digits than its factorization.

21145122035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31150.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21145122035 its reverse (53022154112), we get a palindrome (74167276147).

The spelling of 21145122035 in words is "twenty-one billion, one hundred forty-five million, one hundred twenty-two thousand, thirty-five".