1213002021 has 32 divisors (see below), whose sum is σ = 2036422656. Its totient is φ = 623880000.

The previous prime is 1213002017. The next prime is 1213002029. The reversal of 1213002021 is 1202003121.

It is not a de Polignac number, because 1213002021 - 2² = 1213002017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213001988 and 1213002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213002029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2665 + ... + 49326.

It is an arithmetic number, because the mean of its divisors is an integer number (63638208).

Almost surely, 2^1213002021 is an apocalyptic number.

1213002021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213002021 is a deficient number, since it is larger than the sum of its proper divisors (823420635).

1213002021 is a wasteful number, since it uses less digits than its factorization.

1213002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52113.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1213002021 is about 34828.1785484111. The cubic root of 1213002021 is about 1066.4827652468.

Adding to 1213002021 its reverse (1202003121), we get a palindrome (2415005142).

It can be divided in two parts, 121300 and 2021, that added together give a palindrome (123321).

The spelling of 1213002021 in words is "one billion, two hundred thirteen million, two thousand, twenty-one".