1021511031213 has 32 divisors (see below), whose sum is σ = 1481441498496. Its totient is φ = 623485513728.

The previous prime is 1021511031197. The next prime is 1021511031221. The reversal of 1021511031213 is 3121301151201.

It is not a de Polignac number, because 1021511031213 - 2⁴ = 1021511031197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021511031213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021511031263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8703045 + ... + 8819637.

It is an arithmetic number, because the mean of its divisors is an integer number (46295046828).

Almost surely, 2^{1021511031213} is an apocalyptic number.

It is an amenable number.

1021511031213 is a deficient number, since it is larger than the sum of its proper divisors (459930467283).

1021511031213 is a wasteful number, since it uses less digits than its factorization.

1021511031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121293.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 1021511031213 its reverse (3121301151201), we get a palindrome (4142812182414).

The spelling of 1021511031213 in words is "one trillion, twenty-one billion, five hundred eleven million, thirty-one thousand, two hundred thirteen".