21101463 has 6 divisors (see below), whose sum is σ = 30479904. Its totient is φ = 14067636.

The previous prime is 21101461. The next prime is 21101503. The reversal of 21101463 is 36410112.

It is a happy number.

It is not a de Polignac number, because 21101463 - 2¹ = 21101461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172295 + ... + 1172312.

It is an arithmetic number, because the mean of its divisors is an integer number (5079984).

Almost surely, 2^21101463 is an apocalyptic number.

21101463 is a deficient number, since it is larger than the sum of its proper divisors (9378441).

21101463 is a wasteful number, since it uses less digits than its factorization.

21101463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344613 (or 2344610 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21101463 is about 4593.6328760579. The cubic root of 21101463 is about 276.3360352541.

Adding to 21101463 its reverse (36410112), we get a palindrome (57511575).

The spelling of 21101463 in words is "twenty-one million, one hundred one thousand, four hundred sixty-three".