20211021012 has 384 divisors, whose sum is σ = 65371299840. Its totient is φ = 4707901440.

The previous prime is 20211020969. The next prime is 20211021043. The reversal of 20211021012 is 21012011202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19564848 + ... + 19565880.

It is an arithmetic number, because the mean of its divisors is an integer number (170237760).

Almost surely, 2^20211021012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32685649920).

20211021012 is an abundant number, since it is smaller than the sum of its proper divisors (45160278828).

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

20211021012 is a wasteful number, since it uses less digits than its factorization.

20211021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1141 counting only the distinct ones).

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

Adding to 20211021012 its reverse (21012011202), we get a palindrome (41223032214).

The spelling of 20211021012 in words is "twenty billion, two hundred eleven million, twenty-one thousand, twelve".