21970240441 has 2 divisors, whose sum is σ = 21970240442. Its totient is φ = 21970240440.

The previous prime is 21970240427. The next prime is 21970240489. The reversal of 21970240441 is 14404207912.

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., 14504589225 + 7465651216 = 120435^2 + 86404^2 .

It is a cyclic number.

It is not a de Polignac number, because 21970240441 - 2¹⁵ = 21970207673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21970240397 and 21970240406.

It is not a weakly prime, because it can be changed into another prime (21970243441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985120220 + 10985120221.

It is an arithmetic number, because the mean of its divisors is an integer number (10985120221).

Almost surely, 2^21970240441 is an apocalyptic number.

It is an amenable number.

21970240441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970240441 is an equidigital number, since it uses as much as digits as its factorization.

21970240441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 21970240441 in words is "twenty-one billion, nine hundred seventy million, two hundred forty thousand, four hundred forty-one".