211012010110021 has 4 divisors (see below), whose sum is σ = 211131971459200. Its totient is φ = 210892048760844.

The previous prime is 211012010110009. The next prime is 211012010110043. The reversal of 211012010110021 is 120011010210112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211012010110021 - 2¹³ = 211012010101829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211012010109983 and 211012010110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211012010110051) 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, 59980671951 + ... + 59980675468.

It is an arithmetic number, because the mean of its divisors is an integer number (52782992864800).

Almost surely, 2^{211012010110021} is an apocalyptic number.

It is an amenable number.

211012010110021 is a deficient number, since it is larger than the sum of its proper divisors (119961349179).

211012010110021 is a wasteful number, since it uses less digits than its factorization.

211012010110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119961349178.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211012010110021 its reverse (120011010210112), we get a palindrome (331023020320133).

The spelling of 211012010110021 in words is "two hundred eleven trillion, twelve billion, ten million, one hundred ten thousand, twenty-one".