21011211022020 has 24 divisors (see below), whose sum is σ = 58831390861824. Its totient is φ = 5602989605856.

The previous prime is 21011211022013. The next prime is 21011211022073. The reversal of 21011211022020 is 2022011211012.

It is a super-2 number, since 2×21011211022020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175093425124 + ... + 175093425243.

It is an arithmetic number, because the mean of its divisors is an integer number (2451307952576).

Almost surely, 2^{21011211022020} is an apocalyptic number.

21011211022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011211022020 is an abundant number, since it is smaller than the sum of its proper divisors (37820179839804).

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

21011211022020 is a wasteful number, since it uses less digits than its factorization.

21011211022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350186850379 (or 350186850377 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011211022020 its reverse (2022011211012), we get a palindrome (23033222233032).

The spelling of 21011211022020 in words is "twenty-one trillion, eleven billion, two hundred eleven million, twenty-two thousand, twenty".