21543151652 has 48 divisors (see below), whose sum is σ = 41700282624. Its totient is φ = 9656484000.

The previous prime is 21543151601. The next prime is 21543151657. The reversal of 21543151652 is 25615134512.

It is not an unprimeable number, because it can be changed into a prime (21543151657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080127 + ... + 2090457.

It is an arithmetic number, because the mean of its divisors is an integer number (868755888).

Almost surely, 2^21543151652 is an apocalyptic number.

21543151652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21543151652 is a deficient number, since it is larger than the sum of its proper divisors (20157130972).

21543151652 is a wasteful number, since it uses less digits than its factorization.

21543151652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11000 (or 10998 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The spelling of 21543151652 in words is "twenty-one billion, five hundred forty-three million, one hundred fifty-one thousand, six hundred fifty-two".