21651455060 has 48 divisors (see below), whose sum is σ = 46348330896. Its totient is φ = 8493069312.

The previous prime is 21651454999. The next prime is 21651455093. The reversal of 21651455060 is 6055415612.

It can be written as a sum of positive squares in 8 ways, for example, as 1749581584 + 19901873476 = 41828^2 + 141074^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21651455060.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3126722 + ... + 3133638.

It is an arithmetic number, because the mean of its divisors is an integer number (965590227).

Almost surely, 2^21651455060 is an apocalyptic number.

21651455060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21651455060 is an abundant number, since it is smaller than the sum of its proper divisors (24696875836).

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

21651455060 is a wasteful number, since it uses less digits than its factorization.

21651455060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9932 (or 9930 counting only the distinct ones).

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

The spelling of 21651455060 in words is "twenty-one billion, six hundred fifty-one million, four hundred fifty-five thousand, sixty".