21046908711481 has 9 divisors (see below), whose sum is σ = 21366042265071. Its totient is φ = 20732472958032.

The previous prime is 21046908711473. The next prime is 21046908711539. The reversal of 21046908711481 is 18411780964012.

The square root of 21046908711481 is 4587691.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2225332980025 + 18821575731456 = 1491755^2 + 4338384^2 .

It is not a de Polignac number, because 21046908711481 - 2³ = 21046908711473 is a prime.

It is a super-2 number, since 2×21046908711481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046908711401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 307341061 + ... + 307409533.

It is an arithmetic number, because the mean of its divisors is an integer number (2374004696119).

Almost surely, 2^{21046908711481} is an apocalyptic number.

21046908711481 is the 4587691-st square number.

21046908711481 is the 2293846-th centered octagonal number.

It is an amenable number.

21046908711481 is a deficient number, since it is larger than the sum of its proper divisors (319133553590).

21046908711481 is an frugal number, since it uses more digits than its factorization.

21046908711481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137080 (or 68540 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 21046908711481 in words is "twenty-one trillion, forty-six billion, nine hundred eight million, seven hundred eleven thousand, four hundred eighty-one".