209912817962 has 32 divisors (see below), whose sum is σ = 322008960000. Its totient is φ = 102606796656.

The previous prime is 209912817901. The next prime is 209912817967. The reversal of 209912817962 is 269718219902.

It is a super-2 number, since 2×209912817962² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209912817898 and 209912817907.

It is not an unprimeable number, because it can be changed into a prime (209912817967) 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, 8310989 + ... + 8336207.

It is an arithmetic number, because the mean of its divisors is an integer number (10062780000).

Almost surely, 2^209912817962 is an apocalyptic number.

209912817962 is a deficient number, since it is larger than the sum of its proper divisors (112096142038).

209912817962 is a wasteful number, since it uses less digits than its factorization.

209912817962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25818.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 209912817962 in words is "two hundred nine billion, nine hundred twelve million, eight hundred seventeen thousand, nine hundred sixty-two".