210221012 has 24 divisors (see below), whose sum is σ = 390398400. Its totient is φ = 98833856.

The previous prime is 210221003. The next prime is 210221027. The reversal of 210221012 is 210122012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210220984 and 210221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13937 + ... + 24792.

It is an arithmetic number, because the mean of its divisors is an integer number (16266600).

Almost surely, 2^210221012 is an apocalyptic number.

It is an amenable number.

210221012 is a deficient number, since it is larger than the sum of its proper divisors (180177388).

210221012 is a wasteful number, since it uses less digits than its factorization.

210221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38815 (or 38813 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210221012 is about 14499.0003793365. Note that the first 3 decimals coincide. The cubic root of 210221012 is about 594.6006424974.

Subtracting from 210221012 its sum of digits (11), we obtain a square (210221001 = 14499²).

Adding to 210221012 its reverse (210122012), we get a palindrome (420343024).

The spelling of 210221012 in words is "two hundred ten million, two hundred twenty-one thousand, twelve".