21798428941 has 2 divisors, whose sum is σ = 21798428942. Its totient is φ = 21798428940.

The previous prime is 21798428933. The next prime is 21798428957. The reversal of 21798428941 is 14982489712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21360991716 + 437437225 = 146154^2 + 20915^2 .

It is a cyclic number.

It is not a de Polignac number, because 21798428941 - 2³ = 21798428933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21798428921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10899214470 + 10899214471.

It is an arithmetic number, because the mean of its divisors is an integer number (10899214471).

Almost surely, 2^21798428941 is an apocalyptic number.

It is an amenable number.

21798428941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21798428941 is an equidigital number, since it uses as much as digits as its factorization.

21798428941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 55.

The spelling of 21798428941 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred twenty-eight thousand, nine hundred forty-one".