21340433401 has 8 divisors (see below), whose sum is σ = 24886803200. Its totient is φ = 18291799764.

The previous prime is 21340433393. The next prime is 21340433447. The reversal of 21340433401 is 10433404312.

It is not a de Polignac number, because 21340433401 - 2³ = 21340433393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21340433461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31108161 + ... + 31108846.

It is an arithmetic number, because the mean of its divisors is an integer number (3110850400).

Almost surely, 2^21340433401 is an apocalyptic number.

It is an amenable number.

21340433401 is a deficient number, since it is larger than the sum of its proper divisors (3546369799).

21340433401 is an frugal number, since it uses more digits than its factorization.

21340433401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62217028 (or 62217014 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21340433401 its reverse (10433404312), we get a palindrome (31773837713).

It can be divided in two parts, 2134043 and 3401, that added together give a square (2137444 = 1462²).

The spelling of 21340433401 in words is "twenty-one billion, three hundred forty million, four hundred thirty-three thousand, four hundred one".