21215033143420 has 24 divisors (see below), whose sum is σ = 44575901502048. Its totient is φ = 8481378609600.

The previous prime is 21215033143417. The next prime is 21215033143429. The reversal of 21215033143420 is 2434133051212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215033143429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289627951 + ... + 289701190.

It is an arithmetic number, because the mean of its divisors is an integer number (1857329229252).

Almost surely, 2^{21215033143420} is an apocalyptic number.

21215033143420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21215033143420 is an abundant number, since it is smaller than the sum of its proper divisors (23360868358628).

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

21215033143420 is a wasteful number, since it uses less digits than its factorization.

21215033143420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579330981 (or 579330979 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21215033143420 its reverse (2434133051212), we get a palindrome (23649166194632).

The spelling of 21215033143420 in words is "twenty-one trillion, two hundred fifteen billion, thirty-three million, one hundred forty-three thousand, four hundred twenty".