21121222002 has 16 divisors (see below), whose sum is σ = 43605103872. Its totient is φ = 6813297360.

The previous prime is 21121221983. The next prime is 21121222009. The reversal of 21121222002 is 20022212112.

It is a super-2 number, since 2×21121222002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121222009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56777293 + ... + 56777664.

It is an arithmetic number, because the mean of its divisors is an integer number (2725318992).

Almost surely, 2^21121222002 is an apocalyptic number.

21121222002 is an abundant number, since it is smaller than the sum of its proper divisors (22483881870).

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

21121222002 is a wasteful number, since it uses less digits than its factorization.

21121222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113554993.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21121222002 its reverse (20022212112), we get a palindrome (41143434114).

The spelling of 21121222002 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two".