21100220070 has 64 divisors (see below), whose sum is σ = 51438815424. Its totient is φ = 5538675200.

The previous prime is 21100220069. The next prime is 21100220101. The reversal of 21100220070 is 7002200112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504064 + ... + 544316.

It is an arithmetic number, because the mean of its divisors is an integer number (803731491).

Almost surely, 2^21100220070 is an apocalyptic number.

21100220070 is an abundant number, since it is smaller than the sum of its proper divisors (30338595354).

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

21100220070 is a wasteful number, since it uses less digits than its factorization.

21100220070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40537.

The product of its (nonzero) digits is 56, while the sum is 15.

Adding to 21100220070 its reverse (7002200112), we get a palindrome (28102420182).

The spelling of 21100220070 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, seventy".