212210999956 has 6 divisors (see below), whose sum is σ = 371369249930. Its totient is φ = 106105499976.

The previous prime is 212210999887. The next prime is 212210999977. The reversal of 212210999956 is 659999012212.

It can be written as a sum of positive squares in only one way, i.e., 210919747600 + 1291252356 = 459260^2 + 35934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212210999897 and 212210999906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26526374991 + ... + 26526374998.

Almost surely, 2^212210999956 is an apocalyptic number.

It is an amenable number.

212210999956 is a deficient number, since it is larger than the sum of its proper divisors (159158249974).

212210999956 is a wasteful number, since it uses less digits than its factorization.

212210999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53052749993 (or 53052749991 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 212210999956 in words is "two hundred twelve billion, two hundred ten million, nine hundred ninety-nine thousand, nine hundred fifty-six".