21121002213 has 16 divisors (see below), whose sum is σ = 28589601216. Its totient is φ = 13866652800.

The previous prime is 21121002211. The next prime is 21121002233. The reversal of 21121002213 is 31220012112.

It is not a de Polignac number, because 21121002213 - 2¹ = 21121002211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121002192 and 21121002201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121002211) 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, 831895 + ... + 856907.

It is an arithmetic number, because the mean of its divisors is an integer number (1786850076).

Almost surely, 2^21121002213 is an apocalyptic number.

It is an amenable number.

21121002213 is a deficient number, since it is larger than the sum of its proper divisors (7468599003).

21121002213 is a wasteful number, since it uses less digits than its factorization.

21121002213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29284.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121002213 its reverse (31220012112), we get a palindrome (52341014325).

The spelling of 21121002213 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred thirteen".