21000102101021 has 8 divisors (see below), whose sum is σ = 21022801299744. Its totient is φ = 20977403716080.

The previous prime is 21000102101003. The next prime is 21000102101057. The reversal of 21000102101021 is 12010120100012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000102101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000102100993 and 21000102101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000102101071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61524590 + ... + 61864976.

It is an arithmetic number, because the mean of its divisors is an integer number (2627850162468).

Almost surely, 2^{21000102101021} is an apocalyptic number.

It is an amenable number.

21000102101021 is a deficient number, since it is larger than the sum of its proper divisors (22699198723).

21000102101021 is an equidigital number, since it uses as much as digits as its factorization.

21000102101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406891.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000102101021 its reverse (12010120100012), we get a palindrome (33010222201033).

The spelling of 21000102101021 in words is "twenty-one trillion, one hundred two million, one hundred one thousand, twenty-one".