211421010021 has 32 divisors (see below), whose sum is σ = 321506088960. Its totient is φ = 122591012544.

The previous prime is 211421010007. The next prime is 211421010037. The reversal of 211421010021 is 120010124112.

It is not a de Polignac number, because 211421010021 - 2⁷ = 211421009893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421010721) 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, 1698841 + ... + 1819038.

It is an arithmetic number, because the mean of its divisors is an integer number (10047065280).

Almost surely, 2^211421010021 is an apocalyptic number.

It is an amenable number.

211421010021 is a deficient number, since it is larger than the sum of its proper divisors (110085078939).

211421010021 is a wasteful number, since it uses less digits than its factorization.

211421010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517985.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211421010021 its reverse (120010124112), we get a palindrome (331431134133).

The spelling of 211421010021 in words is "two hundred eleven billion, four hundred twenty-one million, ten thousand, twenty-one".