21887461741 has 2 divisors, whose sum is σ = 21887461742. Its totient is φ = 21887461740.

The previous prime is 21887461723. The next prime is 21887461807. The reversal of 21887461741 is 14716478812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19341855625 + 2545606116 = 139075^2 + 50454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21887461741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21887461721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943730870 + 10943730871.

It is an arithmetic number, because the mean of its divisors is an integer number (10943730871).

Almost surely, 2^21887461741 is an apocalyptic number.

It is an amenable number.

21887461741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21887461741 is an equidigital number, since it uses as much as digits as its factorization.

21887461741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 49.

The spelling of 21887461741 in words is "twenty-one billion, eight hundred eighty-seven million, four hundred sixty-one thousand, seven hundred forty-one".