21101601700 has 18 divisors (see below), whose sum is σ = 45790475906. Its totient is φ = 8440640640.

The previous prime is 21101601659. The next prime is 21101601727. The reversal of 21101601700 is 710610112.

It can be written as a sum of positive squares in 3 ways, for example, as 1269639424 + 19831962276 = 35632^2 + 140826^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105507909 + ... + 105508108.

Almost surely, 2^21101601700 is an apocalyptic number.

21101601700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101601700 is an abundant number, since it is smaller than the sum of its proper divisors (24688874206).

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

21101601700 is a wasteful number, since it uses less digits than its factorization.

21101601700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211016031 (or 211016024 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 19.

The spelling of 21101601700 in words is "twenty-one billion, one hundred one million, six hundred one thousand, seven hundred".