21440434404501 has 48 divisors (see below), whose sum is σ = 35537794131840. Its totient is φ = 12201895157760.

The previous prime is 21440434404491. The next prime is 21440434404511. The reversal of 21440434404501 is 10540443404412.

21440434404501 is a `hidden beast` number, since 2 + 144 + 0 + 4 + 3 + 4 + 4 + 0 + 4 + 501 = 666.

It is an interprime number because it is at equal distance from previous prime (21440434404491) and next prime (21440434404511).

It is not a de Polignac number, because 21440434404501 - 2¹⁰ = 21440434403477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440434404511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17441445 + ... + 18630213.

It is an arithmetic number, because the mean of its divisors is an integer number (740370711080).

Almost surely, 2^{21440434404501} is an apocalyptic number.

21440434404501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21440434404501 is a deficient number, since it is larger than the sum of its proper divisors (14097359727339).

21440434404501 is a wasteful number, since it uses less digits than its factorization.

21440434404501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189946 (or 1189943 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 36.

Adding to 21440434404501 its reverse (10540443404412), we get a palindrome (31980877808913).

The spelling of 21440434404501 in words is "twenty-one trillion, four hundred forty billion, four hundred thirty-four million, four hundred four thousand, five hundred one".