21402213111 has 24 divisors (see below), whose sum is σ = 32839950000. Its totient is φ = 13393164672.

The previous prime is 21402213089. The next prime is 21402213113. The reversal of 21402213111 is 11131220412.

It is not a de Polignac number, because 21402213111 - 2⁶ = 21402213047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402213113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 555486 + ... + 592763.

It is an arithmetic number, because the mean of its divisors is an integer number (1368331250).

Almost surely, 2^21402213111 is an apocalyptic number.

21402213111 is a deficient number, since it is larger than the sum of its proper divisors (11437736889).

21402213111 is a wasteful number, since it uses less digits than its factorization.

21402213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148383 (or 1148380 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21402213111 its reverse (11131220412), we get a palindrome (32533433523).

The spelling of 21402213111 in words is "twenty-one billion, four hundred two million, two hundred thirteen thousand, one hundred eleven".