21261024206140 has 12 divisors (see below), whose sum is σ = 44648150832936. Its totient is φ = 8504409682448.

The previous prime is 21261024206119. The next prime is 21261024206161. The reversal of 21261024206140 is 4160242016212.

It is an interprime number because it is at equal distance from previous prime (21261024206119) and next prime (21261024206161).

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, 531525605134 + ... + 531525605173.

It is an arithmetic number, because the mean of its divisors is an integer number (3720679236078).

Almost surely, 2^{21261024206140} is an apocalyptic number.

21261024206140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21261024206140 is an abundant number, since it is smaller than the sum of its proper divisors (23387126626796).

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

21261024206140 is a wasteful number, since it uses less digits than its factorization.

21261024206140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063051210316 (or 1063051210314 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 21261024206140 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-four million, two hundred six thousand, one hundred forty".