21503055001224 has 32 divisors (see below), whose sum is σ = 53765128199520. Its totient is φ = 7166686240896.

The previous prime is 21503055001189. The next prime is 21503055001243. The reversal of 21503055001224 is 42210055030512.

It is a junction number, because it is equal to n+sod(n) for n = 21503055001191 and 21503055001200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62246634 + ... + 62591129.

It is an arithmetic number, because the mean of its divisors is an integer number (1680160256235).

Almost surely, 2^{21503055001224} is an apocalyptic number.

21503055001224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21503055001224 is an abundant number, since it is smaller than the sum of its proper divisors (32262073198296).

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

21503055001224 is a wasteful number, since it uses less digits than its factorization.

21503055001224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124844949 (or 124844945 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21503055001224 in words is "twenty-one trillion, five hundred three billion, fifty-five million, one thousand, two hundred twenty-four".