21420531145004 has 24 divisors (see below), whose sum is σ = 37625750037456. Its totient is φ = 10670382720000.

The previous prime is 21420531145003. The next prime is 21420531145061. The reversal of 21420531145004 is 40054113502412.

It is not an unprimeable number, because it can be changed into a prime (21420531145003) 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, 6932477 + ... + 9534164.

It is an arithmetic number, because the mean of its divisors is an integer number (1567739584894).

Almost surely, 2^{21420531145004} is an apocalyptic number.

It is an amenable number.

21420531145004 is a deficient number, since it is larger than the sum of its proper divisors (16205218892452).

21420531145004 is a wasteful number, since it uses less digits than its factorization.

21420531145004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16467857 (or 16467855 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21420531145004 its reverse (40054113502412), we get a palindrome (61474644647416).

The spelling of 21420531145004 in words is "twenty-one trillion, four hundred twenty billion, five hundred thirty-one million, one hundred forty-five thousand, four".