21261012546352 has 20 divisors (see below), whose sum is σ = 41364138006136. Its totient is φ = 10586396286720.

The previous prime is 21261012546341. The next prime is 21261012546359. The reversal of 21261012546352 is 25364521016212.

It is a super-2 number, since 2×21261012546352² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21261012546359) 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, 2756870178 + ... + 2756877889.

Almost surely, 2^{21261012546352} is an apocalyptic number.

It is an amenable number.

21261012546352 is a deficient number, since it is larger than the sum of its proper divisors (20103125459784).

21261012546352 is a wasteful number, since it uses less digits than its factorization.

21261012546352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5513748316 (or 5513748310 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21261012546352 in words is "twenty-one trillion, two hundred sixty-one billion, twelve million, five hundred forty-six thousand, three hundred fifty-two".