21621271562741 has 8 divisors (see below), whose sum is σ = 21627131368800. Its totient is φ = 21615412457520.

The previous prime is 21621271562711. The next prime is 21621271562791. The reversal of 21621271562741 is 14726517212612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21621271562741 - 2³⁴ = 21604091693557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621271562711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64758530 + ... + 65091548.

It is an arithmetic number, because the mean of its divisors is an integer number (2703391421100).

Almost surely, 2^{21621271562741} is an apocalyptic number.

It is an amenable number.

21621271562741 is a deficient number, since it is larger than the sum of its proper divisors (5859806059).

21621271562741 is a wasteful number, since it uses less digits than its factorization.

21621271562741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350419.

The product of its digits is 564480, while the sum is 47.

The spelling of 21621271562741 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-one million, five hundred sixty-two thousand, seven hundred forty-one".