10021721223654 has 48 divisors (see below), whose sum is σ = 24823146085920. Its totient is φ = 2862488678400.

The previous prime is 10021721223557. The next prime is 10021721223671. The reversal of 10021721223654 is 45632212712001.

10021721223654 is a `hidden beast` number, since 1 + 0 + 0 + 2 + 172 + 122 + 365 + 4 = 666.

It is a super-2 number, since 2×10021721223654² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11526697 + ... + 12365604.

It is an arithmetic number, because the mean of its divisors is an integer number (517148876790).

Almost surely, 2^{10021721223654} is an apocalyptic number.

10021721223654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

10021721223654 is an abundant number, since it is smaller than the sum of its proper divisors (14801424862266).

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

10021721223654 is a wasteful number, since it uses less digits than its factorization.

10021721223654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23895645 (or 23895642 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

Adding to 10021721223654 its reverse (45632212712001), we get a palindrome (55653933935655).

The spelling of 10021721223654 in words is "ten trillion, twenty-one billion, seven hundred twenty-one million, two hundred twenty-three thousand, six hundred fifty-four".