212209900 has 36 divisors (see below), whose sum is σ = 526282288. Its totient is φ = 72757440.

The previous prime is 212209897. The next prime is 212209903. The reversal of 212209900 is 9902212.

It is an interprime number because it is at equal distance from previous prime (212209897) and next prime (212209903).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (212209903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150879 + ... + 152278.

Almost surely, 2^212209900 is an apocalyptic number.

212209900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212209900 is an abundant number, since it is smaller than the sum of its proper divisors (314072388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212209900 is a wasteful number, since it uses less digits than its factorization.

212209900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303178 (or 303171 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 212209900 is about 14567.4259908880. The cubic root of 212209900 is about 596.4699197689.

The spelling of 212209900 in words is "two hundred twelve million, two hundred nine thousand, nine hundred".