21215201214 has 16 divisors (see below), whose sum is σ = 42599450880. Its totient is φ = 7043559000.

The previous prime is 21215201209. The next prime is 21215201237. The reversal of 21215201214 is 41210251212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7042054 + ... + 7045065.

It is an arithmetic number, because the mean of its divisors is an integer number (2662465680).

Almost surely, 2^21215201214 is an apocalyptic number.

21215201214 is an abundant number, since it is smaller than the sum of its proper divisors (21384249666).

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

21215201214 is a wasteful number, since it uses less digits than its factorization.

21215201214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14087375.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21215201214 its reverse (41210251212), we get a palindrome (62425452426).

The spelling of 21215201214 in words is "twenty-one billion, two hundred fifteen million, two hundred one thousand, two hundred fourteen".