21230212221240 has 128 divisors (see below), whose sum is σ = 70360197350400. Its totient is φ = 5081569758720.

The previous prime is 21230212221223. The next prime is 21230212221293. The reversal of 21230212221240 is 4212221203212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21230212221240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101689987 + ... + 101898546.

It is an arithmetic number, because the mean of its divisors is an integer number (549689041800).

Almost surely, 2^{21230212221240} is an apocalyptic number.

21230212221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230212221240 is an abundant number, since it is smaller than the sum of its proper divisors (49129985129160).

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

21230212221240 is a wasteful number, since it uses less digits than its factorization.

21230212221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203588637 (or 203588633 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21230212221240 its reverse (4212221203212), we get a palindrome (25442433424452).

The spelling of 21230212221240 in words is "twenty-one trillion, two hundred thirty billion, two hundred twelve million, two hundred twenty-one thousand, two hundred forty".