21501434420241 has 16 divisors (see below), whose sum is σ = 28686077760960. Its totient is φ = 14325540904640.

The previous prime is 21501434420177. The next prime is 21501434420261. The reversal of 21501434420241 is 14202443410512.

It is a cyclic number.

It is not a de Polignac number, because 21501434420241 - 2⁶ = 21501434420177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21501434420261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229598215 + ... + 229691843.

It is an arithmetic number, because the mean of its divisors is an integer number (1792879860060).

Almost surely, 2^{21501434420241} is an apocalyptic number.

It is an amenable number.

21501434420241 is a deficient number, since it is larger than the sum of its proper divisors (7184643340719).

21501434420241 is a wasteful number, since it uses less digits than its factorization.

21501434420241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139536.

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 21501434420241 its reverse (14202443410512), we get a palindrome (35703877830753).

The spelling of 21501434420241 in words is "twenty-one trillion, five hundred one billion, four hundred thirty-four million, four hundred twenty thousand, two hundred forty-one".