21425321445 has 32 divisors (see below), whose sum is σ = 39022884864. Its totient is φ = 9936379200.

The previous prime is 21425321429. The next prime is 21425321447. The reversal of 21425321445 is 54412352412.

It is not a de Polignac number, because 21425321445 - 2⁴ = 21425321429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425321447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2819041 + ... + 2826630.

It is an arithmetic number, because the mean of its divisors is an integer number (1219465152).

Almost surely, 2^21425321445 is an apocalyptic number.

It is an amenable number.

21425321445 is a deficient number, since it is larger than the sum of its proper divisors (17597563419).

21425321445 is a wasteful number, since it uses less digits than its factorization.

21425321445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5645713.

The product of its digits is 38400, while the sum is 33.

Adding to 21425321445 its reverse (54412352412), we get a palindrome (75837673857).

The spelling of 21425321445 in words is "twenty-one billion, four hundred twenty-five million, three hundred twenty-one thousand, four hundred forty-five".