1211312002021 has 8 divisors (see below), whose sum is σ = 1321439573664. Its totient is φ = 1101185813520.

The previous prime is 1211312001973. The next prime is 1211312002027. The reversal of 1211312002021 is 1202002131121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211312002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211312001986 and 1211312002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312002027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2513086 + ... + 2956048.

It is an arithmetic number, because the mean of its divisors is an integer number (165179946708).

Almost surely, 2^{1211312002021} is an apocalyptic number.

1211312002021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211312002021 is a deficient number, since it is larger than the sum of its proper divisors (110127571643).

1211312002021 is a wasteful number, since it uses less digits than its factorization.

1211312002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691571.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1211312002021 its reverse (1202002131121), we get a palindrome (2413314133142).

The spelling of 1211312002021 in words is "one trillion, two hundred eleven billion, three hundred twelve million, two thousand, twenty-one".