21020110156211 has 16 divisors (see below), whose sum is σ = 22729686377760. Its totient is φ = 19371107750400.

The previous prime is 21020110156181. The next prime is 21020110156219. The reversal of 21020110156211 is 11265101102012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21020110156211 - 2¹⁸ = 21020109894067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020110156219) 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, 398240 + ... + 6496061.

It is an arithmetic number, because the mean of its divisors is an integer number (1420605398610).

Almost surely, 2^{21020110156211} is an apocalyptic number.

21020110156211 is a deficient number, since it is larger than the sum of its proper divisors (1709576221549).

21020110156211 is a wasteful number, since it uses less digits than its factorization.

21020110156211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6898694.

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 21020110156211 its reverse (11265101102012), we get a palindrome (32285211258223).

The spelling of 21020110156211 in words is "twenty-one trillion, twenty billion, one hundred ten million, one hundred fifty-six thousand, two hundred eleven".