212021121207 has 32 divisors (see below), whose sum is σ = 332160378880. Its totient is φ = 117776423520.

The previous prime is 212021121199. The next prime is 212021121227. The reversal of 212021121207 is 702121120212.

It is not a de Polignac number, because 212021121207 - 2³ = 212021121199 is a prime.

It is a super-3 number, since 3×212021121207³ (a number of 35 digits) contains 333 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021121227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365857 + ... + 746922.

It is an arithmetic number, because the mean of its divisors is an integer number (10380011840).

Almost surely, 2^212021121207 is an apocalyptic number.

212021121207 is a deficient number, since it is larger than the sum of its proper divisors (120139257673).

212021121207 is a wasteful number, since it uses less digits than its factorization.

212021121207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113043.

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 212021121207 its reverse (702121120212), we get a palindrome (914142241419).

The spelling of 212021121207 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, two hundred seven".