212021121015 has 24 divisors (see below), whose sum is σ = 400912666128. Its totient is φ = 102798119040.

The previous prime is 212021121001. The next prime is 212021121047. The reversal of 212021121015 is 510121120212.

It is not a de Polignac number, because 212021121015 - 2¹⁹ = 212020596727 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214162254 + ... + 214163243.

It is an arithmetic number, because the mean of its divisors is an integer number (16704694422).

Almost surely, 2^212021121015 is an apocalyptic number.

212021121015 is a deficient number, since it is larger than the sum of its proper divisors (188891545113).

212021121015 is a wasteful number, since it uses less digits than its factorization.

212021121015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428325519 (or 428325516 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 212021121015 its reverse (510121120212), we get a palindrome (722142241227).

The spelling of 212021121015 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, fifteen".