2121651052220 has 96 divisors (see below), whose sum is σ = 5178531240960. Its totient is φ = 715155609600.

The previous prime is 2121651052211. The next prime is 2121651052223. The reversal of 2121651052220 is 222501561212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121651052223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1533251 + ... + 2567909.

It is an arithmetic number, because the mean of its divisors is an integer number (53943033760).

Almost surely, 2^{2121651052220} is an apocalyptic number.

2121651052220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121651052220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2589265620480).

2121651052220 is an abundant number, since it is smaller than the sum of its proper divisors (3056880188740).

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

2121651052220 is a wasteful number, since it uses less digits than its factorization.

2121651052220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034923 (or 1034921 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 2121651052220 in words is "two trillion, one hundred twenty-one billion, six hundred fifty-one million, fifty-two thousand, two hundred twenty".