21223401049 has 2 divisors, whose sum is σ = 21223401050. Its totient is φ = 21223401048.

The previous prime is 21223400969. The next prime is 21223401061. The reversal of 21223401049 is 94010432212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19834497225 + 1388903824 = 140835^2 + 37268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223401049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21223401079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611700524 + 10611700525.

It is an arithmetic number, because the mean of its divisors is an integer number (10611700525).

Almost surely, 2^21223401049 is an apocalyptic number.

It is an amenable number.

21223401049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223401049 is an equidigital number, since it uses as much as digits as its factorization.

21223401049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21223401049 in words is "twenty-one billion, two hundred twenty-three million, four hundred one thousand, forty-nine".