21963308290506 has 48 divisors (see below), whose sum is σ = 51947631747648. Its totient is φ = 6651143145600.

The previous prime is 21963308290477. The next prime is 21963308290523. The reversal of 21963308290506 is 60509280336912.

21963308290506 is a `hidden beast` number, since 2 + 19 + 6 + 3 + 30 + 8 + 2 + 90 + 506 = 666.

It is a super-2 number, since 2×21963308290506² (a number of 27 digits) contains 22 as substring.

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, 36406911 + ... + 37005266.

It is an arithmetic number, because the mean of its divisors is an integer number (1082242328076).

Almost surely, 2^{21963308290506} is an apocalyptic number.

21963308290506 is an abundant number, since it is smaller than the sum of its proper divisors (29984323457142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21963308290506 is a wasteful number, since it uses less digits than its factorization.

21963308290506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73413707 (or 73413704 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 21963308290506 in words is "twenty-one trillion, nine hundred sixty-three billion, three hundred eight million, two hundred ninety thousand, five hundred six".