21354901722 has 448 divisors, whose sum is σ = 63301803264. Its totient is φ = 5240401920.

The previous prime is 21354901691. The next prime is 21354901741. The reversal of 21354901722 is 22710945312.

21354901722 is a `hidden beast` number, since 2 + 135 + 490 + 17 + 22 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 220153578 + ... + 220153674.

It is an arithmetic number, because the mean of its divisors is an integer number (141298668).

Almost surely, 2^21354901722 is an apocalyptic number.

21354901722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21354901722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31650901632).

21354901722 is an abundant number, since it is smaller than the sum of its proper divisors (41946901542).

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

21354901722 is a wasteful number, since it uses less digits than its factorization.

21354901722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21354901722 in words is "twenty-one billion, three hundred fifty-four million, nine hundred one thousand, seven hundred twenty-two".