209213468772 has 216 divisors, whose sum is σ = 626075126208. Its totient is φ = 54334822080.

The previous prime is 209213468731. The next prime is 209213468777. The reversal of 209213468772 is 277864312902.

It is a super-2 number, since 2×209213468772² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209213468777) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 24399478 + ... + 24408050.

Almost surely, 2^209213468772 is an apocalyptic number.

209213468772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209213468772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313037563104).

209213468772 is an abundant number, since it is smaller than the sum of its proper divisors (416861657436).

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

209213468772 is an equidigital number, since it uses as much as digits as its factorization.

209213468772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8637 (or 8596 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 209213468772 in words is "two hundred nine billion, two hundred thirteen million, four hundred sixty-eight thousand, seven hundred seventy-two".