21295919700 has 216 divisors, whose sum is σ = 72937519200. Its totient is φ = 5154259200.

The previous prime is 21295919683. The next prime is 21295919713. The reversal of 21295919700 is 791959212.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7888951 + ... + 7891649.

It is an arithmetic number, because the mean of its divisors is an integer number (337673700).

Almost surely, 2^21295919700 is an apocalyptic number.

21295919700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21295919700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36468759600).

21295919700 is an abundant number, since it is smaller than the sum of its proper divisors (51641599500).

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

21295919700 is a wasteful number, since it uses less digits than its factorization.

21295919700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3527 (or 3517 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The spelling of 21295919700 in words is "twenty-one billion, two hundred ninety-five million, nine hundred nineteen thousand, seven hundred".