21535156460 has 24 divisors (see below), whose sum is σ = 45228501360. Its totient is φ = 8613172544.

The previous prime is 21535156457. The next prime is 21535156463. The reversal of 21535156460 is 6465153512.

It is an interprime number because it is at equal distance from previous prime (21535156457) and next prime (21535156463).

It is not an unprimeable number, because it can be changed into a prime (21535156463) 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, 163907 + ... + 264453.

It is an arithmetic number, because the mean of its divisors is an integer number (1884520890).

Almost surely, 2^21535156460 is an apocalyptic number.

21535156460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21535156460 is an abundant number, since it is smaller than the sum of its proper divisors (23693344900).

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

21535156460 is a wasteful number, since it uses less digits than its factorization.

21535156460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111265 (or 111263 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 21535156460 in words is "twenty-one billion, five hundred thirty-five million, one hundred fifty-six thousand, four hundred sixty".