21012010212021 has 8 divisors (see below), whose sum is σ = 28017958284864. Its totient is φ = 14007034473600.

The previous prime is 21012010212007. The next prime is 21012010212043. The reversal of 21012010212021 is 12021201021012.

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

It is not a de Polignac number, because 21012010212021 - 2¹⁵ = 21012010179253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012010212001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243033180 + ... + 243119621.

It is an arithmetic number, because the mean of its divisors is an integer number (3502244785608).

Almost surely, 2^{21012010212021} is an apocalyptic number.

It is an amenable number.

21012010212021 is a deficient number, since it is larger than the sum of its proper divisors (7005948072843).

21012010212021 is a wasteful number, since it uses less digits than its factorization.

21012010212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486167211.

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

Adding to 21012010212021 its reverse (12021201021012), we get a palindrome (33033211233033).

The spelling of 21012010212021 in words is "twenty-one trillion, twelve billion, ten million, two hundred twelve thousand, twenty-one".