21025504140213 has 16 divisors (see below), whose sum is σ = 29683377654336. Its totient is φ = 13192334081280.

The previous prime is 21025504140187. The next prime is 21025504140269. The reversal of 21025504140213 is 31204140552012.

It is not a de Polignac number, because 21025504140213 - 2⁶ = 21025504140149 is a prime.

It is a super-2 number, since 2×21025504140213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025504140293) 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, 2822143 + ... + 7072163.

It is an arithmetic number, because the mean of its divisors is an integer number (1855211103396).

Almost surely, 2^{21025504140213} is an apocalyptic number.

It is an amenable number.

21025504140213 is a deficient number, since it is larger than the sum of its proper divisors (8657873514123).

21025504140213 is a wasteful number, since it uses less digits than its factorization.

21025504140213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347044.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21025504140213 its reverse (31204140552012), we get a palindrome (52229644692225).

The spelling of 21025504140213 in words is "twenty-one trillion, twenty-five billion, five hundred four million, one hundred forty thousand, two hundred thirteen".