21653041661332 has 12 divisors (see below), whose sum is σ = 37906647378516. Its totient is φ = 10822570981760.

The previous prime is 21653041661263. The next prime is 21653041661351. The reversal of 21653041661332 is 23316614035612.

It can be written as a sum of positive squares in 2 ways, for example, as 13727217660676 + 7925824000656 = 3705026^2 + 2815284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987449893 + ... + 987471820.

It is an arithmetic number, because the mean of its divisors is an integer number (3158887281543).

Almost surely, 2^{21653041661332} is an apocalyptic number.

It is an amenable number.

21653041661332 is a deficient number, since it is larger than the sum of its proper divisors (16253605717184).

21653041661332 is a wasteful number, since it uses less digits than its factorization.

21653041661332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974924458 (or 1974924456 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

Adding to 21653041661332 its reverse (23316614035612), we get a palindrome (44969655696944).

The spelling of 21653041661332 in words is "twenty-one trillion, six hundred fifty-three billion, forty-one million, six hundred sixty-one thousand, three hundred thirty-two".