21210221121022 has 4 divisors (see below), whose sum is σ = 31815331681536. Its totient is φ = 10605110560510.

The previous prime is 21210221120953. The next prime is 21210221121043. The reversal of 21210221121022 is 22012112201212.

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

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, 5302555280254 + ... + 5302555280257.

It is an arithmetic number, because the mean of its divisors is an integer number (7953832920384).

Almost surely, 2^{21210221121022} is an apocalyptic number.

21210221121022 is a deficient number, since it is larger than the sum of its proper divisors (10605110560514).

21210221121022 is a wasteful number, since it uses less digits than its factorization.

21210221121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605110560513.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21210221121022 its reverse (22012112201212), we get a palindrome (43222333322234).

The spelling of 21210221121022 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-two".