21121002215214 has 64 divisors (see below), whose sum is σ = 46747141797888. Its totient is φ = 6308517168000.

The previous prime is 21121002215207. The next prime is 21121002215273. The reversal of 21121002215214 is 41251220012112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5617669 + ... + 8590704.

It is an arithmetic number, because the mean of its divisors is an integer number (730424090592).

Almost surely, 2^{21121002215214} is an apocalyptic number.

21121002215214 is an abundant number, since it is smaller than the sum of its proper divisors (25626139582674).

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

21121002215214 is a wasteful number, since it uses less digits than its factorization.

21121002215214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14208713.

The product of its (nonzero) digits is 640, while the sum is 24.

Adding to 21121002215214 its reverse (41251220012112), we get a palindrome (62372222227326).

The spelling of 21121002215214 in words is "twenty-one trillion, one hundred twenty-one billion, two million, two hundred fifteen thousand, two hundred fourteen".