21143253228 has 24 divisors (see below), whose sum is σ = 49365704640. Its totient is φ = 7043258640.

The previous prime is 21143253211. The next prime is 21143253233. The reversal of 21143253228 is 82235234112.

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, 541918 + ... + 579621.

It is an arithmetic number, because the mean of its divisors is an integer number (2056904360).

Almost surely, 2^21143253228 is an apocalyptic number.

It is an amenable number.

21143253228 is an abundant number, since it is smaller than the sum of its proper divisors (28222451412).

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

21143253228 is a wasteful number, since it uses less digits than its factorization.

21143253228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123117 (or 1123115 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The spelling of 21143253228 in words is "twenty-one billion, one hundred forty-three million, two hundred fifty-three thousand, two hundred twenty-eight".