21214026550021 has 16 divisors (see below), whose sum is σ = 22348430141440. Its totient is φ = 20081416501440.

The previous prime is 21214026549979. The next prime is 21214026550033. The reversal of 21214026550021 is 12005562041212.

It is a cyclic number.

It is not a de Polignac number, because 21214026550021 - 2²¹ = 21214024452869 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 (21214026550091) 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, 132614716 + ... + 132774586.

It is an arithmetic number, because the mean of its divisors is an integer number (1396776883840).

Almost surely, 2^{21214026550021} is an apocalyptic number.

It is an amenable number.

21214026550021 is a deficient number, since it is larger than the sum of its proper divisors (1134403591419).

21214026550021 is a wasteful number, since it uses less digits than its factorization.

21214026550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165436.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21214026550021 its reverse (12005562041212), we get a palindrome (33219588591233).

The spelling of 21214026550021 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, five hundred fifty thousand, twenty-one".