21230040402000 has 240 divisors, whose sum is σ = 78511188190032. Its totient is φ = 5328323788800.

The previous prime is 21230040401951. The next prime is 21230040402013. The reversal of 21230040402000 is 20404003212.

21230040402000 is a `hidden beast` number, since 212 + 30 + 0 + 404 + 0 + 20 + 0 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1051149865536 + 20178890536464 = 1025256^2 + 4492092^2 .

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34383609 + ... + 34995608.

Almost surely, 2^{21230040402000} is an apocalyptic number.

21230040402000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230040402000 is an abundant number, since it is smaller than the sum of its proper divisors (57281147788032).

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

21230040402000 is a wasteful number, since it uses less digits than its factorization.

21230040402000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69379263 (or 69379244 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21230040402000 its reverse (20404003212), we get a palindrome (21250444405212).

The spelling of 21230040402000 in words is "twenty-one trillion, two hundred thirty billion, forty million, four hundred two thousand".