11421621681 has 16 divisors (see below), whose sum is σ = 16114775040. Its totient is φ = 7180767440.

The previous prime is 11421621643. The next prime is 11421621703. The reversal of 11421621681 is 18612612411.

It is a de Polignac number, because none of the positive numbers 2^k-11421621681 is a prime.

It is a super-4 number, since 4×11421621681⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (11421621611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160811 + ... + 1170608.

It is an arithmetic number, because the mean of its divisors is an integer number (1007173440).

Almost surely, 2^11421621681 is an apocalyptic number.

It is an amenable number.

11421621681 is a deficient number, since it is larger than the sum of its proper divisors (4693153359).

11421621681 is a wasteful number, since it uses less digits than its factorization.

11421621681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331516.

The product of its digits is 4608, while the sum is 33.

The spelling of 11421621681 in words is "eleven billion, four hundred twenty-one million, six hundred twenty-one thousand, six hundred eighty-one".