21012121011022 has 4 divisors (see below), whose sum is σ = 31518181516536. Its totient is φ = 10506060505510.

The previous prime is 21012121011001. The next prime is 21012121011059. The reversal of 21012121011022 is 22011012121012.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21012121010987 and 21012121011005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253030252754 + ... + 5253030252757.

It is an arithmetic number, because the mean of its divisors is an integer number (7879545379134).

Almost surely, 2^{21012121011022} is an apocalyptic number.

21012121011022 is a deficient number, since it is larger than the sum of its proper divisors (10506060505514).

21012121011022 is a wasteful number, since it uses less digits than its factorization.

21012121011022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506060505513.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012121011022 its reverse (22011012121012), we get a palindrome (43023133132034).

The spelling of 21012121011022 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, eleven thousand, twenty-two".