21530551431532 has 24 divisors (see below), whose sum is σ = 44265609238032. Its totient is φ = 9033797803200.

The previous prime is 21530551431497. The next prime is 21530551431533. The reversal of 21530551431532 is 23513415503512.

It is not an unprimeable number, because it can be changed into a prime (21530551431533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18820411519 + ... + 18820412662.

It is an arithmetic number, because the mean of its divisors is an integer number (1844400384918).

Almost surely, 2^{21530551431532} is an apocalyptic number.

21530551431532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21530551431532 is an abundant number, since it is smaller than the sum of its proper divisors (22735057806500).

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

21530551431532 is a wasteful number, since it uses less digits than its factorization.

21530551431532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37640824209 (or 37640824207 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 21530551431532 in words is "twenty-one trillion, five hundred thirty billion, five hundred fifty-one million, four hundred thirty-one thousand, five hundred thirty-two".