21663411149975 has 24 divisors (see below), whose sum is σ = 30700700216928. Its totient is φ = 14854643481600.

The previous prime is 21663411149957. The next prime is 21663411150067. The reversal of 21663411149975 is 57994111436612.

It is not a de Polignac number, because 21663411149975 - 2⁸ = 21663411149719 is a prime.

It is a super-2 number, since 2×21663411149975² (a number of 27 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 23 ways as a sum of consecutive naturals, for example, 8907935 + ... + 11076015.

It is an arithmetic number, because the mean of its divisors is an integer number (1279195842372).

Almost surely, 2^{21663411149975} is an apocalyptic number.

21663411149975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21663411149975 is a deficient number, since it is larger than the sum of its proper divisors (9037289066953).

21663411149975 is a wasteful number, since it uses less digits than its factorization.

21663411149975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225195 (or 2225190 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 59.

The spelling of 21663411149975 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred forty-nine thousand, nine hundred seventy-five".