21405111230 has 32 divisors (see below), whose sum is σ = 42569354304. Its totient is φ = 7708028416.

The previous prime is 21405111209. The next prime is 21405111271. The reversal of 21405111230 is 3211150412.

It is a super-2 number, since 2×21405111230² (a number of 21 digits) contains 22 as substring.

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, 2733317 + ... + 2741136.

It is an arithmetic number, because the mean of its divisors is an integer number (1330292322).

Almost surely, 2^21405111230 is an apocalyptic number.

21405111230 is a deficient number, since it is larger than the sum of its proper divisors (21164243074).

21405111230 is a wasteful number, since it uses less digits than its factorization.

21405111230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474500.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21405111230 its reverse (3211150412), we get a palindrome (24616261642).

The spelling of 21405111230 in words is "twenty-one billion, four hundred five million, one hundred eleven thousand, two hundred thirty".