21461021311 has 8 divisors (see below), whose sum is σ = 22043100800. Its totient is φ = 20879049888.

The previous prime is 21461021297. The next prime is 21461021333. The reversal of 21461021311 is 11312016412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21461021311 - 2⁹ = 21461020799 is a prime.

It is a super-2 number, since 2×21461021311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461021381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527890 + ... + 567088.

It is an arithmetic number, because the mean of its divisors is an integer number (2755387600).

Almost surely, 2^21461021311 is an apocalyptic number.

21461021311 is a deficient number, since it is larger than the sum of its proper divisors (582079489).

21461021311 is a wasteful number, since it uses less digits than its factorization.

21461021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54033.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21461021311 its reverse (11312016412), we get a palindrome (32773037723).

The spelling of 21461021311 in words is "twenty-one billion, four hundred sixty-one million, twenty-one thousand, three hundred eleven".