1210013021 has 4 divisors (see below), whose sum is σ = 1382872032. Its totient is φ = 1037154012.

The previous prime is 1210012913. The next prime is 1210013083. The reversal of 1210013021 is 1203100121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1203100121 = 19 ⋅63321059.

It is a cyclic number.

It is not a de Polignac number, because 1210013021 - 2¹⁸ = 1209750877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210012993 and 1210013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210013221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86429495 + ... + 86429508.

It is an arithmetic number, because the mean of its divisors is an integer number (345718008).

Almost surely, 2^1210013021 is an apocalyptic number.

It is an amenable number.

1210013021 is a deficient number, since it is larger than the sum of its proper divisors (172859011).

1210013021 is an equidigital number, since it uses as much as digits as its factorization.

1210013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172859010.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1210013021 is about 34785.2414250642. The cubic root of 1210013021 is about 1065.6060591239.

Adding to 1210013021 its reverse (1203100121), we get a palindrome (2413113142).

The spelling of 1210013021 in words is "one billion, two hundred ten million, thirteen thousand, twenty-one".