21121001022 has 32 divisors (see below), whose sum is σ = 46538457984. Its totient is φ = 6336932000.

The previous prime is 21121000961. The next prime is 21121001081. The reversal of 21121001022 is 22010012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121000989 and 21121001007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1577568 + ... + 1590899.

It is an arithmetic number, because the mean of its divisors is an integer number (1454326812).

Almost surely, 2^21121001022 is an apocalyptic number.

21121001022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121001022 is an abundant number, since it is smaller than the sum of its proper divisors (25417456962).

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

21121001022 is a wasteful number, since it uses less digits than its factorization.

21121001022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168584.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121001022 its reverse (22010012112), we get a palindrome (43131013134).

The spelling of 21121001022 in words is "twenty-one billion, one hundred twenty-one million, one thousand, twenty-two".