21623523551012 has 12 divisors (see below), whose sum is σ = 37842593668236. Its totient is φ = 10811353931520.

The previous prime is 21623523550991. The next prime is 21623523551017. The reversal of 21623523551012 is 21015532532612.

It can be written as a sum of positive squares in 2 ways, for example, as 6761372869696 + 14862150681316 = 2600264^2 + 3855146^2 .

It is a super-2 number, since 2×21623523551012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21623523551017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101841689 + ... + 102053792.

It is an arithmetic number, because the mean of its divisors is an integer number (3153549472353).

Almost surely, 2^{21623523551012} is an apocalyptic number.

It is an amenable number.

21623523551012 is a deficient number, since it is larger than the sum of its proper divisors (16219070117224).

21623523551012 is a wasteful number, since it uses less digits than its factorization.

21623523551012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203921998 (or 203921996 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 21623523551012 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-three million, five hundred fifty-one thousand, twelve".