20211891024 has 80 divisors (see below), whose sum is σ = 56254385600. Its totient is φ = 6216403968.

The previous prime is 20211891023. The next prime is 20211891031. The reversal of 20211891024 is 42019811202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20211890982 and 20211891000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211891023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1878492 + ... + 1889220.

It is an arithmetic number, because the mean of its divisors is an integer number (703179820).

Almost surely, 2^20211891024 is an apocalyptic number.

20211891024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20211891024 is an abundant number, since it is smaller than the sum of its proper divisors (36042494576).

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

20211891024 is a wasteful number, since it uses less digits than its factorization.

20211891024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13772 (or 13766 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The spelling of 20211891024 in words is "twenty billion, two hundred eleven million, eight hundred ninety-one thousand, twenty-four".