21434034457 has 8 divisors (see below), whose sum is σ = 23664301920. Its totient is φ = 19250720160.

The previous prime is 21434034449. The next prime is 21434034467. The reversal of 21434034457 is 75443043412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21434034457 - 2³ = 21434034449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434034467) 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, 11737332 + ... + 11739157.

It is an arithmetic number, because the mean of its divisors is an integer number (2958037740).

Almost surely, 2^21434034457 is an apocalyptic number.

It is an amenable number.

21434034457 is a deficient number, since it is larger than the sum of its proper divisors (2230267463).

21434034457 is a wasteful number, since it uses less digits than its factorization.

21434034457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23476583.

The product of its (nonzero) digits is 161280, while the sum is 37.

Adding to 21434034457 its reverse (75443043412), we get a palindrome (96877077869).

The spelling of 21434034457 in words is "twenty-one billion, four hundred thirty-four million, thirty-four thousand, four hundred fifty-seven".