21002210020019 has 4 divisors (see below), whose sum is σ = 21093922727760. Its totient is φ = 20910497312280.

The previous prime is 21002210019977. The next prime is 21002210020021. The reversal of 21002210020019 is 91002001220012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002210020019 is a prime.

It is a super-2 number, since 2×21002210020019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002210020219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45856353527 + ... + 45856353984.

It is an arithmetic number, because the mean of its divisors is an integer number (5273480681940).

Almost surely, 2^{21002210020019} is an apocalyptic number.

21002210020019 is a deficient number, since it is larger than the sum of its proper divisors (91712707741).

21002210020019 is an equidigital number, since it uses as much as digits as its factorization.

21002210020019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91712707740.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21002210020019 in words is "twenty-one trillion, two billion, two hundred ten million, twenty thousand, nineteen".