21142020004 has 72 divisors (see below), whose sum is σ = 43642543392. Its totient is φ = 8934629760.

The previous prime is 21142019963. The next prime is 21142020007. The reversal of 21142020004 is 40002024112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142020004.

It is not an unprimeable number, because it can be changed into a prime (21142020007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4758424 + ... + 4762864.

It is an arithmetic number, because the mean of its divisors is an integer number (606146436).

Almost surely, 2^21142020004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142020004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21821271696).

21142020004 is an abundant number, since it is smaller than the sum of its proper divisors (22500523388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142020004 is a wasteful number, since it uses less digits than its factorization.

21142020004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793 (or 4784 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21142020004 its reverse (40002024112), we get a palindrome (61144044116).

The spelling of 21142020004 in words is "twenty-one billion, one hundred forty-two million, twenty thousand, four".