21352537532 has 12 divisors (see below), whose sum is σ = 37432615920. Its totient is φ = 10657504416.

The previous prime is 21352537519. The next prime is 21352537543. The reversal of 21352537532 is 23573525312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4688528 + ... + 4693079.

It is an arithmetic number, because the mean of its divisors is an integer number (3119384660).

Almost surely, 2^21352537532 is an apocalyptic number.

It is an amenable number.

21352537532 is a deficient number, since it is larger than the sum of its proper divisors (16080078388).

21352537532 is a wasteful number, since it uses less digits than its factorization.

21352537532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9382180 (or 9382178 counting only the distinct ones).

The product of its digits is 189000, while the sum is 38.

The spelling of 21352537532 in words is "twenty-one billion, three hundred fifty-two million, five hundred thirty-seven thousand, five hundred thirty-two".