211421213021 has 8 divisors (see below), whose sum is σ = 212976783864. Its totient is φ = 209865821440.

The previous prime is 211421213011. The next prime is 211421213027. The reversal of 211421213021 is 120312124112.

It can be written as a sum of positive squares in 4 ways, for example, as 4704588100 + 206716624921 = 68590^2 + 454661^2 .

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-211421213021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211421212984 and 211421213002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421213027) 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, 3161891 + ... + 3228063.

It is an arithmetic number, because the mean of its divisors is an integer number (26622097983).

Almost surely, 2^211421213021 is an apocalyptic number.

It is an amenable number.

211421213021 is a deficient number, since it is larger than the sum of its proper divisors (1555570843).

211421213021 is a wasteful number, since it uses less digits than its factorization.

211421213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89631.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 211421213021 its reverse (120312124112), we get a palindrome (331733337133).

The spelling of 211421213021 in words is "two hundred eleven billion, four hundred twenty-one million, two hundred thirteen thousand, twenty-one".