21020402314213 has 4 divisors (see below), whose sum is σ = 21120025074208. Its totient is φ = 20920779554220.

The previous prime is 21020402314169. The next prime is 21020402314231. The reversal of 21020402314213 is 31241320402012.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020402314213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020402314253) 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, 49811379681 + ... + 49811380102.

It is an arithmetic number, because the mean of its divisors is an integer number (5280006268552).

Almost surely, 2^{21020402314213} is an apocalyptic number.

It is an amenable number.

21020402314213 is a deficient number, since it is larger than the sum of its proper divisors (99622759995).

21020402314213 is an equidigital number, since it uses as much as digits as its factorization.

21020402314213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99622759994.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21020402314213 its reverse (31241320402012), we get a palindrome (52261722716225).

The spelling of 21020402314213 in words is "twenty-one trillion, twenty billion, four hundred two million, three hundred fourteen thousand, two hundred thirteen".