21002210012021 has 16 divisors (see below), whose sum is σ = 24152312217600. Its totient is φ = 17889773212080.

The previous prime is 21002210012011. The next prime is 21002210012041. The reversal of 21002210012021 is 12021001220012.

It is not a de Polignac number, because 21002210012021 - 2³⁴ = 20985030142837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002210011987 and 21002210012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002210012011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7963445 + ... + 10267466.

It is an arithmetic number, because the mean of its divisors is an integer number (1509519513600).

Almost surely, 2^{21002210012021} is an apocalyptic number.

It is an amenable number.

21002210012021 is a deficient number, since it is larger than the sum of its proper divisors (3150102205579).

21002210012021 is a wasteful number, since it uses less digits than its factorization.

21002210012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18231944.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002210012021 its reverse (12021001220012), we get a palindrome (33023211232033).

The spelling of 21002210012021 in words is "twenty-one trillion, two billion, two hundred ten million, twelve thousand, twenty-one".