21420213141 has 16 divisors (see below), whose sum is σ = 30082270400. Its totient is φ = 13520089728.

The previous prime is 21420213137. The next prime is 21420213151. The reversal of 21420213141 is 14131202412.

It is not a de Polignac number, because 21420213141 - 2² = 21420213137 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420213151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25066 + ... + 208491.

It is an arithmetic number, because the mean of its divisors is an integer number (1880141900).

Almost surely, 2^21420213141 is an apocalyptic number.

It is an amenable number.

21420213141 is a deficient number, since it is larger than the sum of its proper divisors (8662057259).

21420213141 is a wasteful number, since it uses less digits than its factorization.

21420213141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235188.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21420213141 its reverse (14131202412), we get a palindrome (35551415553).

The spelling of 21420213141 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, one hundred forty-one".