20921298354 has 224 divisors, whose sum is σ = 54847964160. Its totient is φ = 5915397600.

The previous prime is 20921298313. The next prime is 20921298401. The reversal of 20921298354 is 45389212902.

20921298354 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 1 + 298 + 354 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 21634779 + ... + 21635745.

Almost surely, 2^20921298354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20921298354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27423982080).

20921298354 is an abundant number, since it is smaller than the sum of its proper divisors (33926665806).

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

20921298354 is a wasteful number, since it uses less digits than its factorization.

20921298354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 20921298354 in words is "twenty billion, nine hundred twenty-one million, two hundred ninety-eight thousand, three hundred fifty-four".