212030021091 has 16 divisors (see below), whose sum is σ = 323110264064. Its totient is φ = 121153675104.

The previous prime is 212030021017. The next prime is 212030021141. The reversal of 212030021091 is 190120030212.

It is a de Polignac number, because none of the positive numbers 2^k-212030021091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (212030021011) 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, 163101 + ... + 671313.

It is an arithmetic number, because the mean of its divisors is an integer number (20194391504).

Almost surely, 2^212030021091 is an apocalyptic number.

212030021091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212030021091 is a deficient number, since it is larger than the sum of its proper divisors (111080242973).

212030021091 is a wasteful number, since it uses less digits than its factorization.

212030021091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528090.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 212030021091 in words is "two hundred twelve billion, thirty million, twenty-one thousand, ninety-one".