21210022101021 has 64 divisors (see below), whose sum is σ = 31791059435520. Its totient is φ = 12488561084160.

The previous prime is 21210022101001. The next prime is 21210022101041. The reversal of 21210022101021 is 12010122001212.

It is an interprime number because it is at equal distance from previous prime (21210022101001) and next prime (21210022101041).

It is not a de Polignac number, because 21210022101021 - 2⁶ = 21210022100957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210022101001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56626860 + ... + 57000186.

It is an arithmetic number, because the mean of its divisors is an integer number (496735303680).

Almost surely, 2^{21210022101021} is an apocalyptic number.

It is an amenable number.

21210022101021 is a deficient number, since it is larger than the sum of its proper divisors (10581037334499).

21210022101021 is a wasteful number, since it uses less digits than its factorization.

21210022101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373826.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210022101021 its reverse (12010122001212), we get a palindrome (33220144102233).

The spelling of 21210022101021 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, one hundred one thousand, twenty-one".