2219991021 has 24 divisors (see below), whose sum is σ = 3230061120. Its totient is φ = 1469232000.

The previous prime is 2219991017. The next prime is 2219991023. The reversal of 2219991021 is 1201999122.

It is not a de Polignac number, because 2219991021 - 2² = 2219991017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2219991023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 777246 + ... + 780096.

It is an arithmetic number, because the mean of its divisors is an integer number (134585880).

Almost surely, 2^2219991021 is an apocalyptic number.

It is an amenable number.

2219991021 is a deficient number, since it is larger than the sum of its proper divisors (1010070099).

2219991021 is a wasteful number, since it uses less digits than its factorization.

2219991021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457 (or 3454 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 2219991021 is about 47116.7806731317. The cubic root of 2219991021 is about 1304.5189912656.

The spelling of 2219991021 in words is "two billion, two hundred nineteen million, nine hundred ninety-one thousand, twenty-one".