1212010021 has 16 divisors (see below), whose sum is σ = 1287244800. Its totient is φ = 1139419008.

The previous prime is 1212010003. The next prime is 1212010027. The reversal of 1212010021 is 1200102121.

It is a cyclic number.

It is not a de Polignac number, because 1212010021 - 2²³ = 1203621413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212010027) 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, 163620 + ... + 170866.

It is an arithmetic number, because the mean of its divisors is an integer number (80452800).

Almost surely, 2^1212010021 is an apocalyptic number.

It is an amenable number.

1212010021 is a deficient number, since it is larger than the sum of its proper divisors (75234779).

1212010021 is an equidigital number, since it uses as much as digits as its factorization.

1212010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7428.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1212010021 is about 34813.9342936130. The cubic root of 1212010021 is about 1066.1919607207.

Adding to 1212010021 its reverse (1200102121), we get a palindrome (2412112142).

The spelling of 1212010021 in words is "one billion, two hundred twelve million, ten thousand, twenty-one".