21102220220070 has 64 divisors (see below), whose sum is σ = 55511295217920. Its totient is φ = 5091444758400.

The previous prime is 21102220220069. The next prime is 21102220220071. The reversal of 21102220220070 is 7002202220112.

It is an interprime number because it is at equal distance from previous prime (21102220220069) and next prime (21102220220071).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102220220071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151461465 + ... + 151600724.

It is an arithmetic number, because the mean of its divisors is an integer number (867363987780).

Almost surely, 2^{21102220220070} is an apocalyptic number.

21102220220070 is an abundant number, since it is smaller than the sum of its proper divisors (34409074997850).

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

21102220220070 is a wasteful number, since it uses less digits than its factorization.

21102220220070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303062421.

The product of its (nonzero) digits is 448, while the sum is 21.

Adding to 21102220220070 its reverse (7002202220112), we get a palindrome (28104422440182).

The spelling of 21102220220070 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, two hundred twenty thousand, seventy".