21725033377 has 2 divisors, whose sum is σ = 21725033378. Its totient is φ = 21725033376.

The previous prime is 21725033353. The next prime is 21725033437. The reversal of 21725033377 is 77333052712.

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., 19052556961 + 2672476416 = 138031^2 + 51696^2 .

It is a cyclic number.

It is not a de Polignac number, because 21725033377 - 2²³ = 21716644769 is a prime.

It is not a weakly prime, because it can be changed into another prime (21725033347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10862516688 + 10862516689.

It is an arithmetic number, because the mean of its divisors is an integer number (10862516689).

Almost surely, 2^21725033377 is an apocalyptic number.

It is an amenable number.

21725033377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21725033377 is an equidigital number, since it uses as much as digits as its factorization.

21725033377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 40.

The spelling of 21725033377 in words is "twenty-one billion, seven hundred twenty-five million, thirty-three thousand, three hundred seventy-seven".