1211010012 has 36 divisors (see below), whose sum is σ = 3062819760. Its totient is φ = 403451712.

The previous prime is 1211009951. The next prime is 1211010029. The reversal of 1211010012 is 2100101121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1211009976 and 1211010003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67153 + ... + 83255.

Almost surely, 2^1211010012 is an apocalyptic number.

1211010012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211010012 is an abundant number, since it is smaller than the sum of its proper divisors (1851809748).

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

1211010012 is a wasteful number, since it uses less digits than its factorization.

1211010012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18202 (or 18197 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1211010012 is about 34799.5691352637. The cubic root of 1211010012 is about 1065.8986477097.

Adding to 1211010012 its reverse (2100101121), we get a palindrome (3311111133).

It can be divided in two parts, 12110 and 10012, that added together give a palindrome (22122).

The spelling of 1211010012 in words is "one billion, two hundred eleven million, ten thousand, twelve".