21421022055 has 32 divisors (see below), whose sum is σ = 36045471744. Its totient is φ = 10841757696.

The previous prime is 21421022053. The next prime is 21421022081. The reversal of 21421022055 is 55022012412.

It is not a de Polignac number, because 21421022055 - 2¹ = 21421022053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421022053) 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, 200634 + ... + 288263.

It is an arithmetic number, because the mean of its divisors is an integer number (1126420992).

Almost surely, 2^21421022055 is an apocalyptic number.

21421022055 is a deficient number, since it is larger than the sum of its proper divisors (14624449689).

21421022055 is a wasteful number, since it uses less digits than its factorization.

21421022055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489055.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21421022055 its reverse (55022012412), we get a palindrome (76443034467).

The spelling of 21421022055 in words is "twenty-one billion, four hundred twenty-one million, twenty-two thousand, fifty-five".