21000422054 has 8 divisors (see below), whose sum is σ = 32017037088. Its totient is φ = 10328076360.

The previous prime is 21000421999. The next prime is 21000422057. The reversal of 21000422054 is 45022400012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21000422054² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000422057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86067182 + ... + 86067425.

It is an arithmetic number, because the mean of its divisors is an integer number (4002129636).

Almost surely, 2^21000422054 is an apocalyptic number.

21000422054 is a deficient number, since it is larger than the sum of its proper divisors (11016615034).

21000422054 is a wasteful number, since it uses less digits than its factorization.

21000422054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172134670.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21000422054 its reverse (45022400012), we get a palindrome (66022822066).

The spelling of 21000422054 in words is "twenty-one billion, four hundred twenty-two thousand, fifty-four".