21361291743460 has 12 divisors (see below), whose sum is σ = 44858712661308. Its totient is φ = 8544516697376.

The previous prime is 21361291743439. The next prime is 21361291743469. The reversal of 21361291743460 is 6434719216312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10365064348324 + 10996227395136 = 3219482^2 + 3316056^2 .

It is not an unprimeable number, because it can be changed into a prime (21361291743469) 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, 534032293567 + ... + 534032293606.

It is an arithmetic number, because the mean of its divisors is an integer number (3738226055109).

Almost surely, 2^{21361291743460} is an apocalyptic number.

21361291743460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21361291743460 is an abundant number, since it is smaller than the sum of its proper divisors (23497420917848).

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

21361291743460 is a wasteful number, since it uses less digits than its factorization.

21361291743460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068064587182 (or 1068064587180 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 21361291743460 in words is "twenty-one trillion, three hundred sixty-one billion, two hundred ninety-one million, seven hundred forty-three thousand, four hundred sixty".