2111221210021 has 16 divisors (see below), whose sum is σ = 2632590374400. Its totient is φ = 1644845888880.

The previous prime is 2111221210019. The next prime is 2111221210027. The reversal of 2111221210021 is 1200121221112.

It is a cyclic number.

It is not a de Polignac number, because 2111221210021 - 2¹ = 2111221210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111221209977 and 2111221210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221210027) 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, 1691391 + ... + 2661436.

It is an arithmetic number, because the mean of its divisors is an integer number (164536898400).

Almost surely, 2^{2111221210021} is an apocalyptic number.

It is an amenable number.

2111221210021 is a deficient number, since it is larger than the sum of its proper divisors (521369164379).

2111221210021 is a wasteful number, since it uses less digits than its factorization.

2111221210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359144.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2111221210021 its reverse (1200121221112), we get a palindrome (3311342431133).

The spelling of 2111221210021 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".