21550212214 has 32 divisors (see below), whose sum is σ = 35519251680. Its totient is φ = 9760547328.

The previous prime is 21550212209. The next prime is 21550212269. The reversal of 21550212214 is 41221205512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278089 + ... + 347035.

It is an arithmetic number, because the mean of its divisors is an integer number (1109976615).

Almost surely, 2^21550212214 is an apocalyptic number.

21550212214 is a deficient number, since it is larger than the sum of its proper divisors (13969039466).

21550212214 is a wasteful number, since it uses less digits than its factorization.

21550212214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69312.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21550212214 its reverse (41221205512), we get a palindrome (62771417726).

The spelling of 21550212214 in words is "twenty-one billion, five hundred fifty million, two hundred twelve thousand, two hundred fourteen".