1211205102 has 8 divisors (see below), whose sum is σ = 2422410216. Its totient is φ = 403735032.

The previous prime is 1211205091. The next prime is 1211205113. The reversal of 1211205102 is 2015021121.

It is an interprime number because it is at equal distance from previous prime (1211205091) and next prime (1211205113).

It is a sphenic number, since it is the product of 3 distinct primes.

1211205102 is an admirable number.

It is a super-2 number, since 2×1211205102² = 2934035598221660808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100933753 + ... + 100933764.

It is an arithmetic number, because the mean of its divisors is an integer number (302801277).

Almost surely, 2^1211205102 is an apocalyptic number.

1211205102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1211205102 is a wasteful number, since it uses less digits than its factorization.

1211205102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201867522.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1211205102 is about 34802.3720743285. The cubic root of 1211205102 is about 1065.9558823044.

Adding to 1211205102 its reverse (2015021121), we get a palindrome (3226226223).

The spelling of 1211205102 in words is "one billion, two hundred eleven million, two hundred five thousand, one hundred two".