21421041120 has 72 divisors (see below), whose sum is σ = 73099307736. Its totient is φ = 5712277248.

The previous prime is 21421041091. The next prime is 21421041127. The reversal of 21421041120 is 2114012412.

21421041120 is a `hidden beast` number, since 21 + 4 + 210 + 411 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×21421041120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21421041093 and 21421041102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421041127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7436422 + ... + 7439301.

It is an arithmetic number, because the mean of its divisors is an integer number (1015268163).

Almost surely, 2^21421041120 is an apocalyptic number.

21421041120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421041120 is an abundant number, since it is smaller than the sum of its proper divisors (51678266616).

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

21421041120 is a wasteful number, since it uses less digits than its factorization.

21421041120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14875744 (or 14875733 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21421041120 its reverse (2114012412), we get a palindrome (23535053532).

The spelling of 21421041120 in words is "twenty-one billion, four hundred twenty-one million, forty-one thousand, one hundred twenty".