21057202767770 has 64 divisors (see below), whose sum is σ = 40982120315136. Its totient is φ = 7743864038400.

The previous prime is 21057202767761. The next prime is 21057202767779. The reversal of 21057202767770 is 7776720275012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21057202767761) and next prime (21057202767779).

It is not an unprimeable number, because it can be changed into a prime (21057202767779) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42115745 + ... + 42612795.

It is an arithmetic number, because the mean of its divisors is an integer number (640345629924).

Almost surely, 2^{21057202767770} is an apocalyptic number.

21057202767770 is a deficient number, since it is larger than the sum of its proper divisors (19924917547366).

21057202767770 is a wasteful number, since it uses less digits than its factorization.

21057202767770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498375.

The product of its (nonzero) digits is 4033680, while the sum is 53.

The spelling of 21057202767770 in words is "twenty-one trillion, fifty-seven billion, two hundred two million, seven hundred sixty-seven thousand, seven hundred seventy".