21421022214 has 32 divisors (see below), whose sum is σ = 43031180160. Its totient is φ = 7108863552.

The previous prime is 21421022179. The next prime is 21421022219. The reversal of 21421022214 is 41222012412.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421022219) 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, 2183829 + ... + 2193615.

It is an arithmetic number, because the mean of its divisors is an integer number (1344724380).

Almost surely, 2^21421022214 is an apocalyptic number.

21421022214 is an abundant number, since it is smaller than the sum of its proper divisors (21610157946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21421022214 is a wasteful number, since it uses less digits than its factorization.

21421022214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21421022214 its reverse (41222012412), we get a palindrome (62643034626).

The spelling of 21421022214 in words is "twenty-one billion, four hundred twenty-one million, twenty-two thousand, two hundred fourteen".