21434142145 has 32 divisors (see below), whose sum is σ = 28101427200. Its totient is φ = 15599361024.

The previous prime is 21434142137. The next prime is 21434142167. The reversal of 21434142145 is 54124143412.

It is a happy number.

It is not a de Polignac number, because 21434142145 - 2³ = 21434142137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3041536 + ... + 3048574.

It is an arithmetic number, because the mean of its divisors is an integer number (878169600).

Almost surely, 2^21434142145 is an apocalyptic number.

It is an amenable number.

21434142145 is a deficient number, since it is larger than the sum of its proper divisors (6667285055).

21434142145 is a wasteful number, since it uses less digits than its factorization.

21434142145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729.

The product of its digits is 15360, while the sum is 31.

Adding to 21434142145 its reverse (54124143412), we get a palindrome (75558285557).

The spelling of 21434142145 in words is "twenty-one billion, four hundred thirty-four million, one hundred forty-two thousand, one hundred forty-five".