21531433022220 has 192 divisors, whose sum is σ = 70054487387136. Its totient is φ = 4883279953920.

The previous prime is 21531433022219. The next prime is 21531433022273. The reversal of 21531433022220 is 2222033413512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3871837 + ... + 7619316.

It is an arithmetic number, because the mean of its divisors is an integer number (364867121808).

Almost surely, 2^{21531433022220} is an apocalyptic number.

21531433022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21531433022220 is an abundant number, since it is smaller than the sum of its proper divisors (48523054364916).

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

21531433022220 is a wasteful number, since it uses less digits than its factorization.

21531433022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11491360 (or 11491358 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21531433022220 its reverse (2222033413512), we get a palindrome (23753466435732).

The spelling of 21531433022220 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty-three million, twenty-two thousand, two hundred twenty".